seated human 3d model

single human figure, HO scale 1:87, full body, correct proportions, seated pose, adult passenger (30-60), relaxed posture, torso slightly tilted forward, head slightly down as if dozing, hips centered, knees bent at 90 degrees, legs together, feet flat, arms resting loosely on lap, neutral sleepy expression, casual clothing, simplified features, thickened limbs, watertight manifold mesh, no holes, no missing parts, no floating elements, centered model, optimized for STL export, no furniture, no environment, only the character