Custom cage installation

We are planning on boxing in the top of the rear strut towers and bracing the main hoop there. He says that we should be able to get close to 45°. He will also run a bar between those rear braces for chassis rigidity. After that he will work on the harness bars and I believe he said that he was going to do more diagonal bracing for the rear hoop. The driver side door bar will also be removable using the following assembly...

http://www.appliedracing.com/roll-bars-cages-and-components/swing-out-bar-kits-with-clevis-mount.html