A concrete wall bay with a 1.14 m by 2.4 m doorway and a hinged steel leaf. The leaf hangs on three barrel hinges on the left stile, carries two stiffening ribs and a vertical pull bar, and swings outward on a pivot set on the wall face. A steel threshold plate stands proud of the plinth. Dimensions 4.02 × 3.55 × 0.52 m (X × Y × Z). Metre units, +Y up, +Z front; origin on the ground at the footprint centre unless stated. Damp conifer forest realism: wet concrete and corroded corrugated steel, weathered pine, dark bark and soil, deep needle green, olive canvas, gunmetal and machined steel, with five emissive colours (amber fire, white floodlight, green status, blue screen, red warning) that also form the loot rarity ladder. Rigid node-transform clips open, close turn named nodes on their own pivots. No skinning, no skeleton, no skin weighting, no collision or navigation data.