Create the exterior of the Narkina ...

Create the exterior of the Narkina 5 Imperial prison from Star Wars Andor. A massive seven-sided industrial prison rising from an ocean. The building has seven identical outer perimeter sections, wide outward-sloping exterior walls, an open central shaft, radial connecting bridges, and a raised central command structure. Target 295 blocks in diameter, with a realistic architectural silhouette. Use only stone blocks initially, no interior decoration. Prioritize accurate geometry and continuous connected walls.