to me a tear drop is an upgrade from tenting. if a tree branch falls on a tent, the tent is destroyed. if a tree branch falls or puts a hole in the foamie, i would think it would be easy to repair. just shoot in a bit of that expandable/spray foam and cover in canvas. sorry gpw, but not parking under a tree might prove difficult when camping at state parks and national ones.
seriously there isn't any of these vehicles that won't get damaged by something. my cousin backed up into a post with a winnebaggo, had to make repairs on that one.
i have not tested it, because i just don't see a need for it, but i believe i could stand on top of mine. my roof is only the 1" stuff. so i am thinking if supported in the right places, and covered good, you could make a bench out of this stuff. and i do believe the floor could be make with it also.
my one questionable thing would be those spars. i know when i built mine i even posted my thoughts then. as they stood they would not be strong enough, too flimsy, but if covered good, i still wonder if they could be used as spars, would they be strong enough for that. i think i will have to try it and see.