Interior and another Poser Pic
The shelf/folding sleeping platform I built was first truck lined:
But I would have to bring camping pads or yoga mats along with to not pop the cheapo Kmart (unlimited returns for 1 year) air mattress.
So I carpeted it. Admittedly not the prettiest job in the world, but it's 1000x more comfortable now...and the dogs will be happier too. The duct tape (which looks sort of like patent leather edges) will be covered by cloth tape soon.
The wires coming out of the back are there because I pre-wired the electric panel in the front of the box for future fog lights up on the roof rack (front and rear).
Here's said panel:
And the view from the front:
And the poser (yes I'm down a taillight bulb):