hollow octagonal ring 3d model

Create a 3D model of a large-scale octagonal space habitat ring. IMPORTANT: This is NOT a solid object. This is a hollow ring structure. --- SHAPE: * The structure is a perfect regular octagon (8 equal straight sides) * Each side is flat (not curved) * The ring forms a closed loop with a large empty center * The center must be completely hollow (no filling) --- RING STRUCTURE: * The ring has a thin but visible thickness * Outer side: heavy mechanical sci-fi structure * Inner side: habitable surface Think of it as: a hollow polygonal ring, not a block --- CROSS SECTION: * Outer shell (mechanical, detailed) * Inner habitable band (smooth surface) * Hollow center (open void) --- INNER SURFACE (VERY IMPORTANT): * The inside of the ring is where life exists * This surface is slightly concave and continuous along the ring * It contains terrain (subtle), but do NOT over-detail Keep it simple: * light surface variation only * no exaggerated buildings --- PROPORTIONS: * Large overall diameter * Thin