attic ladder 3d model

Create a matching 3D model of the LOWER/UNDERSIDE part of the same bunker hatch construction for a ceiling view (bottom floor looking up). Same proportions and style as the provided hatch: square opening ~80x80 cm, thick steel frame embedded in ceiling, visible bolts, rubber gasket edge. Show the hatch in OPEN position from below: the hatch door swings upward into the upper floor, expose underside details (reinforcement ribs, hinge plates, latch mechanism). Add a descending metal ladder aligned with the opening, same ladder design (rectangular steel rails, anti-slip rungs, side handrails), extending downward ~3 m (10–12 rungs). Clean game-ready topology, separate objects: hatch_frame_bottom, hatch_door_bottom, ladder_bottom, hinges/latch. Correct pivots for animation (door hinge axis, ladder hinge). No environment/background.