170x170 huge open-air modern prison...

170x170 huge open-air modern prison hub only. Make it thick, heavy, deep, and massive, not thin, flat, or decorative. Build a large central courtyard with strong perimeter buildings on all 4 sides, with deep walls, thick corners, upper balconies, wide walkways, and large connector openings north, south, east, and west for future wings. Put a giant cyan “1” floor inlay with a gold halo motif in the center. Keep lots of open walking space. No skulls, no statues, no fountains, no side wings yet. Premium, low-rise, polished, bright at night, social, symmetrical, modern prison, not fantasy.