Im confused by your math and would love to see you pull that number out of plants, just remember the plants need somewhere to grow aswell. Its good for smaller plants like lettuce but 4z of bud in 12 inch triangle? I can see it working if you are talking only about the root space.
In my experience youll produce more per sq ft with trays of short clones on shelves than vertical or angles.
Saying that if you can design this or draw it, it can be printed for you to test out. I cant even get my head around what a trapezoidal pyramid is