Really would appreciate your advice on this unique camper

OMG! That's my dream camper -- 25 years ago.
Convenience, comfort and entertainment (beyond getting "warm" together), are more my priorities, now.
What's the roof material/construction? Any idea?
I should show this to my 22-year-old God-son. Heck, I gotta saw and a drill. It ain't rocket surgery. A little hand-rubbed Teak Oil would help keep him in shape and be a nice finish.
How-the-Devil he gets it on and off his truck, and ties it down, are his problems. Brute force and ignorance might be offered as suggestions.