Casey; Forgive me dragging this thread down a rat-hole about door protection. You're right that the cage pictured definitely has some stuff on it that's better then your average bolt-in 911 cage. The whole design around the A-pillars with the extra gussetting at the bend into the roof bars, and the extra Y where the A-pillars meet the roof look like an excellent strategy for improving the car's roll-over protection.
Have you also considered gusseting the cage to the shell along the A-pillars and roof?
It would be great to see how these guys fill in the rest of the tubes. Keep up the posting!