Once I get them home, I had to stage them on my trailer at a buddy's house, I can send a pic or two. Basically, they are a self supported slide in shell. There is a frame work that slides in to the truck consisting of two rollbars and connecting frame. On top of that mounts a thick fiberglass camper top (a camper shell w/ no roof overhang). The rear door is a lift gate that goes from top to bottom (no tailgate on truck). Then sandwiched in the support frame is a sideways seating system to transport people (these were slide-in's for border patrol vehicles). There are small windows in the front section on both sides that look into a storage shelf and lower bin accessible from the truck with a boot mounting system needed to connect to back window of truck. Also, behind the window on one side of the shell is a large wing door that accesses the backside of a A/C, heating system that was plumbed to the original truck to provide air in the rear.
I don't know if this describes it any better or makes it worse but I will try and get picks. I think the best things about it are the rollbar mounting system and the thick fiberglass shell w/ rear lift gate. The rest of the thing will probably get removed and or replaced.