Single-storey accommodation building massing

Create a clean, editable single-storey student accommodation building for an aviation flight-school campus as a watertight 3D CAD solid suitable for STEP export and AutoCAD import. Use metric dimensions in millimetres. Main rectangular building footprint: 18,000 mm long × 10,000 mm wide. External wall height to eaves: 3,200 mm. Overall roof ridge height: approximately 4,200 mm. Provide a simple symmetrical low-pitched gable roof, approximately 10–12° roof pitch, running along the 18,000 mm building length, with 450 mm roof overhangs on all sides. Add one simple covered entrance centred on the long front elevation: entrance canopy approximately 4,000 mm wide × 2,000 mm projection, supported by two simple square posts approximately 150 × 150 mm. Include a shallow entrance step/platform only if required for clean geometry. Keep the architecture simple, institutional and contemporary, appropriate for accommodation for approximately 20 aviation students. Model exterior massing only: no internal rooms, no furniture, no people, no vehicles, no landscaping, no terrain, no fences, no signage and no decorative objects. Keep all walls, roof elements and canopy as clean geometric solids with flat planar surfaces and minimal unnecessary detail. Do not create curved or sculptural architecture. Do not generate surrounding ground or a site base. Orient the building with its long axis along the X-axis and centre the model near the origin. Generate a manifold, closed, editable solid-body CAD model, avoiding mesh-only geometry, self-intersections, open surfaces, duplicate faces or excessively complex topology. Prioritise compatibility with STEP export and subsequent editing, scaling, moving and rotation in AutoCAD.

Parameters

Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.