Wrap under and on the plywood. This is a critical point to me. So far he only thing holding that plywood on is Gorilla Glue. As good as it may be, I don't like 'a' system to hold it. Especially since this is the connection to the truck rail. By wrapping the canvas under (and on the plywood), now not only would the GG have to fail, but the canvas as well. I like redundentcy.

Interior: I've debated this a bit and have enforced the seams inside and outside. I'm thinking right now of just painting out the interior. I get that the walls will be more easy dented by doing this, yet this is just a Sleeper cap to me than a camper. If I had built it taller (which I now know I could have) and was going to spend time inside it, then I definitely would at least bedsheet it. I did bedsheet cover the overhead storage area earlier and glad I did that part. The rest, probably not going to do.
Another note of design: I keep looking at the tailgate wonder how I could design something to cover that area with the tailgate down. It would add the additional space to allow the pee-toilet the wife wants. I keep going some sorts of slide out, but the bed takes up the whole space in the truck-bed. No way to slide it in.. Canvas, tent style has come to mind, yet setup..
Here's what I mean, I barely have the room..

Maybe you folks can come up with something clever.
