Here are my thoughts for the day...
6 point internal cage. Down legs in the front floor, behind front seats, then behind rear seats. The cage will be sandwich plated to the floor, and tied into the sliders below with an X brace behind the front seats. The spare with either be angled in the rear cargo area sitting on the floor and a cross bar, or mounted outside on the rear. Either way, I cant see out the back window. This can be remedied with a backup camera (or two).
The rear corner guards/fender hoops will end up tieing into the interior cage through the body, just below the rear window, behind the rear door. This will prevent the rear quarters from getting pushed in and a crossbar behind the rear gate will further strenthen this area.
An exo cage adds a bunch more tube, weight, and loss of aerodynamics. I will still add bumpers and fender hoops front and rear. With the design of the tb body, you cant protect the doors and have them still function, and the long spans of tube over the roof would most likely bend down crushing the body anyway.
Rear idea: