asteroid refinery 3d model

Large hard sci-fi asteroid refinery building for a Unity colony strategy game. Must read as a full industrial facility, not a small machine or container. Approx 64m x 64m footprint, 20m tall, 4x4 grid building, isometric/top-down readability. Big primary processing block, large refinery tanks, tall vent stacks, heat radiators, pipe bridges, service gantries, cargo/service apron, clear conduit connection side, reinforced foundation pads. Add tiny human-scale doors, ladders and railings for scale. Worn graphite metal, off-white armour, hazard yellow markings, heat staining. No people, vehicles, terrain, domes, neon or sleek utopian style.