stadium 3d model

A monochrome, 3D printable, manifold STL model of the Aloha Stadium as shown in the reference image. The entire model must be a single, solid, watertight geometry suitable for FDM printing, with no color or texture information. This includes the main stadium bowl with tiered seating and the four prominent cylindrical spiral ramps (two on the left, two on the right) located at the corners of the structure. The exterior crisscross steel truss framework and all structural elements, including the spiral ramps' walls and supports, must be thickened significantly into solid forms to ensure structural integrity during printing. The model should have a flat base underneath for easy build plate adhesion.