diff --git a/src/components/InspectionChecklist.tsx b/src/components/InspectionChecklist.tsx
new file mode 100644
index 0000000..9705518
--- /dev/null
+++ b/src/components/InspectionChecklist.tsx
@@ -0,0 +1,136 @@
+import { CheckCircle, XCircle, Clock, MessageSquare } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { Textarea } from '@/components/ui/textarea';
+import { useModelStore, type ChecklistItem } from '@/stores/useModelStore';
+import { useState } from 'react';
+import { toast } from 'sonner';
+
+function ChecklistRow({ item }: { item: ChecklistItem }) {
+  const { setChecklistItemStatus, setChecklistItemNote } = useModelStore();
+  const [showNote, setShowNote] = useState(item.status === 'rejected');
+
+  const handleApprove = () => {
+    setChecklistItemStatus(item.id, 'approved');
+    setShowNote(false);
+    toast.success(`"${item.label}" aprovado`);
+  };
+
+  const handleReject = () => {
+    setChecklistItemStatus(item.id, 'rejected');
+    setShowNote(true);
+    toast.error(`"${item.label}" reprovado — adicione uma anotação`);
+  };
+
+  const statusColor =
+    item.status === 'approved' ? 'text-success' :
+    item.status === 'rejected' ? 'text-destructive' :
+    'text-muted-foreground';
+
+  const StatusIcon =
+    item.status === 'approved' ? CheckCircle :
+    item.status === 'rejected' ? XCircle :
+    Clock;
+
+  return (
+    <div className="rounded-lg border bg-muted/30 p-3 space-y-2">
+      <div className="flex items-center justify-between gap-2">
+        <div className="flex items-center gap-2 min-w-0">
+          <StatusIcon className={`h-4 w-4 shrink-0 ${statusColor}`} />
+          <span className="font-mono text-xs text-foreground truncate">{item.label}</span>
+        </div>
+        <div className="flex gap-1 shrink-0">
+          <Button
+            variant={item.status === 'approved' ? 'default' : 'ghost'}
+            size="icon"
+            className="h-7 w-7"
+            onClick={handleApprove}
+            title="Aprovar"
+          >
+            <CheckCircle className="h-3.5 w-3.5" />
+          </Button>
+          <Button
+            variant={item.status === 'rejected' ? 'destructive' : 'ghost'}
+            size="icon"
+            className="h-7 w-7"
+            onClick={handleReject}
+            title="Reprovar"
+          >
+            <XCircle className="h-3.5 w-3.5" />
+          </Button>
+        </div>
+      </div>
+
+      {(showNote || item.status === 'rejected') && (
+        <div className="space-y-1">
+          <div className="flex items-center gap-1">
+            <MessageSquare className="h-3 w-3 text-muted-foreground" />
+            <span className="font-mono text-[10px] text-muted-foreground">Anotação</span>
+          </div>
+          <Textarea
+            className="h-16 font-mono text-xs resize-none bg-background"
+            placeholder="Descreva o problema encontrado…"
+            value={item.note}
+            onChange={(e) => setChecklistItemNote(item.id, e.target.value)}
+          />
+        </div>
+      )}
+    </div>
+  );
+}
+
+export function InspectionChecklist() {
+  const { checklist, resetChecklist } = useModelStore();
+
+  const approved = checklist.filter(i => i.status === 'approved').length;
+  const rejected = checklist.filter(i => i.status === 'rejected').length;
+  const total = checklist.length;
+
+  return (
+    <div className="space-y-3">
+      <div className="flex items-center justify-between">
+        <h3 className="font-mono text-xs font-semibold uppercase tracking-widest text-muted-foreground">
+          Checklist de Inspeção
+        </h3>
+        <Button variant="ghost" size="sm" className="h-6 text-[10px]" onClick={resetChecklist}>
+          Resetar
+        </Button>
+      </div>
+
+      {/* Progress summary */}
+      <div className="flex items-center gap-3 rounded-lg border bg-muted/30 px-3 py-2">
+        <div className="flex-1">
+          <div className="h-1.5 rounded-full bg-muted overflow-hidden">
+            <div
+              className="h-full rounded-full bg-primary transition-all"
+              style={{ width: `${((approved + rejected) / total) * 100}%` }}
+            />
+          </div>
+        </div>
+        <span className="font-mono text-[10px] text-muted-foreground shrink-0">
+          {approved + rejected}/{total}
+        </span>
+      </div>
+
+      {/* Status badges */}
+      <div className="flex gap-2">
+        {approved > 0 && (
+          <span className="font-mono text-[10px] text-success flex items-center gap-1">
+            <CheckCircle className="h-3 w-3" /> {approved}
+          </span>
+        )}
+        {rejected > 0 && (
+          <span className="font-mono text-[10px] text-destructive flex items-center gap-1">
+            <XCircle className="h-3 w-3" /> {rejected}
+          </span>
+        )}
+      </div>
+
+      {/* Items */}
+      <div className="space-y-2">
+        {checklist.map(item => (
+          <ChecklistRow key={item.id} item={item} />
+        ))}
+      </div>
+    </div>
+  );
+}
diff --git a/src/components/ViewerControls.tsx b/src/components/ViewerControls.tsx
new file mode 100644
index 0000000..74817dc
--- /dev/null
+++ b/src/components/ViewerControls.tsx
@@ -0,0 +1,43 @@
+import { Eye, Grid3X3 } from 'lucide-react';
+import { Slider } from '@/components/ui/slider';
+import { Button } from '@/components/ui/button';
+import { useModelStore } from '@/stores/useModelStore';
+
+export function ViewerControls() {
+  const { opacity, setOpacity, renderMode, setRenderMode } = useModelStore();
+
+  return (
+    <div className="absolute bottom-4 left-4 z-10 flex items-end gap-3">
+      {/* Opacity slider */}
+      <div className="rounded-lg border bg-card/90 backdrop-blur-sm p-3 shadow-lg w-56">
+        <div className="flex items-center justify-between mb-2">
+          <div className="flex items-center gap-2">
+            <Eye className="h-3.5 w-3.5 text-primary" />
+            <span className="font-mono text-xs text-muted-foreground">Opacidade</span>
+          </div>
+          <span className="font-mono text-xs text-foreground">{Math.round(opacity * 100)}%</span>
+        </div>
+        <Slider
+          value={[opacity * 100]}
+          min={0}
+          max={100}
+          step={1}
+          onValueChange={([v]) => setOpacity(v / 100)}
+        />
+      </div>
+
+      {/* Render mode toggle */}
+      <Button
+        variant={renderMode === 'wireframe' ? 'default' : 'outline'}
+        size="sm"
+        className="gap-2 h-9"
+        onClick={() => setRenderMode(renderMode === 'solid' ? 'wireframe' : 'solid')}
+      >
+        <Grid3X3 className="h-3.5 w-3.5" />
+        <span className="font-mono text-xs">
+          {renderMode === 'wireframe' ? 'Wireframe' : 'Sólido'}
+        </span>
+      </Button>
+    </div>
+  );
+}
diff --git a/src/components/three/ModelViewer.tsx b/src/components/three/ModelViewer.tsx
index 61c724a..ea013f4 100644
--- a/src/components/three/ModelViewer.tsx
+++ b/src/components/three/ModelViewer.tsx
@@ -1,8 +1,9 @@
-import { Suspense, useRef, useMemo } from 'react';
-import { Canvas } from '@react-three/fiber';
-import { OrbitControls, useGLTF, Grid, Environment, Html } from '@react-three/drei';
+import { Suspense, useRef, useMemo, useEffect } from 'react';
+import { Canvas, useFrame } from '@react-three/fiber';
+import { OrbitControls, useGLTF, Grid, Html } from '@react-three/drei';
 import { Loader2 } from 'lucide-react';
 import * as THREE from 'three';
+import { useModelStore } from '@/stores/useModelStore';
 
 interface ModelViewerProps {
   url: string;
@@ -22,6 +23,9 @@ function LoadingFallback() {
 function GLBModel({ url }: { url: string }) {
   const { scene } = useGLTF(url);
   const ref = useRef<THREE.Group>(null);
+  const opacity = useModelStore((s) => s.opacity);
+  const renderMode = useModelStore((s) => s.renderMode);
+  const checklist = useModelStore((s) => s.checklist);
 
   const modelInfo = useMemo(() => {
     const box = new THREE.Box3().setFromObject(scene);
@@ -32,6 +36,41 @@ function GLBModel({ url }: { url: string }) {
     return { size, center };
   }, [scene]);
 
+  // Apply opacity, wireframe, and checklist color feedback
+  useEffect(() => {
+    // Determine overall inspection color
+    const hasRejected = checklist.some(i => i.status === 'rejected');
+    const allApproved = checklist.every(i => i.status === 'approved');
+
+    scene.traverse((child) => {
+      if (child instanceof THREE.Mesh) {
+        // Clone material to avoid shared mutations
+        if (Array.isArray(child.material)) {
+          child.material = child.material.map(m => m.clone());
+        } else {
+          child.material = child.material.clone();
+        }
+        const materials = Array.isArray(child.material) ? child.material : [child.material];
+        materials.forEach((mat: THREE.Material) => {
+          if (mat instanceof THREE.MeshStandardMaterial) {
+            mat.transparent = opacity < 1;
+            mat.opacity = opacity;
+            mat.wireframe = renderMode === 'wireframe';
+            mat.needsUpdate = true;
+            // Color feedback
+            if (hasRejected) {
+              mat.color.setHSL(0, 0.7, 0.5); // red
+            } else if (allApproved) {
+              mat.color.setHSL(0.38, 0.7, 0.45); // green
+            } else {
+              mat.color.set(0x8899aa); // default steel
+            }
+          }
+        });
+      }
+    });
+  }, [scene, opacity, renderMode, checklist]);
+
   return (
     <group ref={ref} position={[-modelInfo.center.x, -modelInfo.center.y, -modelInfo.center.z]}>
       <primitive object={scene} />
@@ -43,8 +82,16 @@ export function ModelViewerCanvas({ url }: ModelViewerProps) {
   return (
     <Canvas
       camera={{ position: [2, 2, 2], fov: 50, near: 0.001, far: 1000 }}
-      gl={{ antialias: true, alpha: true }}
+      gl={{ antialias: true, alpha: true, powerPreference: 'high-performance' }}
+      frameloop="demand"
       className="!bg-background"
+      onCreated={({ gl, invalidate }) => {
+        // Target 72fps for Quest 3 compatibility
+        gl.setPixelRatio(Math.min(window.devicePixelRatio, 1.5));
+        // Continuous render for smooth interaction
+        const loop = () => { invalidate(); requestAnimationFrame(loop); };
+        loop();
+      }}
     >
       <ambientLight intensity={0.6} />
       <directionalLight position={[5, 10, 5]} intensity={1} castShadow />
@@ -76,4 +123,3 @@ export function ModelViewerCanvas({ url }: ModelViewerProps) {
     </Canvas>
   );
 }
-
diff --git a/src/pages/Viewer.tsx b/src/pages/Viewer.tsx
index a735aed..0cbd362 100644
--- a/src/pages/Viewer.tsx
+++ b/src/pages/Viewer.tsx
@@ -3,8 +3,12 @@ import { ArrowLeft, Glasses, Box, Ruler, FileText } from 'lucide-react';
 import { Button } from '@/components/ui/button';
 import { useModelStore } from '@/stores/useModelStore';
 import { ModelViewerCanvas } from '@/components/three/ModelViewer';
+import { ViewerControls } from '@/components/ViewerControls';
+import { InspectionChecklist } from '@/components/InspectionChecklist';
 import { useEffect } from 'react';
 import { toast } from 'sonner';
+import { ScrollArea } from '@/components/ui/scroll-area';
+import { Separator } from '@/components/ui/separator';
 
 const Viewer = () => {
   const navigate = useNavigate();
@@ -53,32 +57,42 @@ const Viewer = () => {
       </header>
 
       <div className="flex flex-1 overflow-hidden">
-        {/* 3D Canvas */}
-        <div className="flex-1">
+        {/* 3D Canvas with floating controls */}
+        <div className="relative flex-1">
           <ModelViewerCanvas url={model.url} />
+          <ViewerControls />
         </div>
 
         {/* Side panel */}
-        <aside className="w-72 shrink-0 overflow-y-auto border-l bg-card p-4">
-          <h2 className="mb-4 font-mono text-xs font-semibold uppercase tracking-widest text-muted-foreground">
-            Informações do Modelo
-          </h2>
+        <aside className="w-80 shrink-0 border-l bg-card">
+          <ScrollArea className="h-full">
+            <div className="p-4 space-y-5">
+              <div>
+                <h2 className="mb-3 font-mono text-xs font-semibold uppercase tracking-widest text-muted-foreground">
+                  Informações do Modelo
+                </h2>
+                <div className="space-y-3">
+                  <InfoItem icon={FileText} label="Arquivo" value={model.fileName} />
+                  <InfoItem
+                    icon={Box}
+                    label="Tamanho"
+                    value={`${(model.fileSize / (1024 * 1024)).toFixed(2)} MB`}
+                  />
+                  <InfoItem icon={Ruler} label="Escala" value="1:1 (mm)" />
+                </div>
+              </div>
 
-          <div className="space-y-4">
-            <InfoItem icon={FileText} label="Arquivo" value={model.fileName} />
-            <InfoItem
-              icon={Box}
-              label="Tamanho"
-              value={`${(model.fileSize / (1024 * 1024)).toFixed(2)} MB`}
-            />
-            <InfoItem icon={Ruler} label="Escala" value="1:1 (mm)" />
+              <Separator />
 
-            <div className="rounded-lg border bg-muted/50 p-3">
-              <p className="font-mono text-xs text-muted-foreground">
-                Use o mouse para orbitar, scroll para zoom. No Quest 3, use o botão acima para entrar em modo imersivo com passthrough.
-              </p>
+              <InspectionChecklist />
+
+              <div className="rounded-lg border bg-muted/50 p-3">
+                <p className="font-mono text-xs text-muted-foreground">
+                  Use o mouse para orbitar, scroll para zoom. Controle a opacidade e o modo de renderização nos controles flutuantes.
+                </p>
+              </div>
             </div>
-          </div>
+          </ScrollArea>
         </aside>
       </div>
     </div>
diff --git a/src/stores/useModelStore.ts b/src/stores/useModelStore.ts
index 040f35f..8130b8f 100644
--- a/src/stores/useModelStore.ts
+++ b/src/stores/useModelStore.ts
@@ -15,6 +15,21 @@ interface FineTuning {
 
 type AnchorMode = 'tracking' | 'manual' | 'fine-tuning';
 type InspectionResult = 'pending' | 'approved' | 'rejected';
+type RenderMode = 'solid' | 'wireframe';
+
+export interface ChecklistItem {
+  id: string;
+  label: string;
+  status: 'pending' | 'approved' | 'rejected';
+  note: string;
+}
+
+const defaultChecklist: ChecklistItem[] = [
+  { id: 'dimensions', label: 'Dimensões Gerais', status: 'pending', note: '' },
+  { id: 'plates', label: 'Posição das Placas', status: 'pending', note: '' },
+  { id: 'holes', label: 'Diâmetro dos Furos', status: 'pending', note: '' },
+  { id: 'weld', label: 'Especificação da Solda', status: 'pending', note: '' },
+];
 
 interface ModelStore {
   model: ModelInfo | null;
@@ -32,6 +47,17 @@ interface ModelStore {
 
   xrSupported: boolean | null;
   setXrSupported: (supported: boolean | null) => void;
+
+  opacity: number;
+  setOpacity: (opacity: number) => void;
+
+  renderMode: RenderMode;
+  setRenderMode: (mode: RenderMode) => void;
+
+  checklist: ChecklistItem[];
+  setChecklistItemStatus: (id: string, status: 'approved' | 'rejected') => void;
+  setChecklistItemNote: (id: string, note: string) => void;
+  resetChecklist: () => void;
 }
 
 const defaultFineTuning: FineTuning = { posX: 0, posY: 0, posZ: 0, rotY: 0 };
@@ -52,4 +78,23 @@ export const useModelStore = create<ModelStore>((set) => ({
 
   xrSupported: null,
   setXrSupported: (xrSupported) => set({ xrSupported }),
+
+  opacity: 1,
+  setOpacity: (opacity) => set({ opacity }),
+
+  renderMode: 'solid',
+  setRenderMode: (renderMode) => set({ renderMode }),
+
+  checklist: defaultChecklist.map(i => ({ ...i })),
+  setChecklistItemStatus: (id, status) => set((state) => ({
+    checklist: state.checklist.map(item =>
+      item.id === id ? { ...item, status } : item
+    ),
+  })),
+  setChecklistItemNote: (id, note) => set((state) => ({
+    checklist: state.checklist.map(item =>
+      item.id === id ? { ...item, note } : item
+    ),
+  })),
+  resetChecklist: () => set({ checklist: defaultChecklist.map(i => ({ ...i })) }),
 }));