Thanks for the good and goofy comments.
Idea: it's a good guess that the idea came to me when I was on the toilet, but no. My bunk is up pretty high and when I rolled over, I stared directly at that useless vertical space near the drop ceiling. So probably for a week or two every morning I would roll over and see it when I was waking up and I would think, what in the heck am I going to use that for?
TP Storage: Until somebody urgently has to go poop and can't find their extra toilet paper, it's hard to understand how great quick and easy access is. Right on, Crazy Grandmother! A point of clarification: I don't use that space to get toilet paper every time I go to the bathroom. It's just storage for extra paper.
Plywood: No, I don't think I ever covered it in a previous post, unless just to say that I was finished with the ceiling. I got that veneer from Home Depot. I think they list it as .20 inch underlayment. Hate to be stereotypical, but this is stereotypical. The bad news is that it's a standard Chinese product. By that I mean, all appearance and almost no substance.
The nice-looking side of the veneer has a ply that is almost literally paper thin. I liked the price, but I regretted it once I started cutting and working with it. That nice looking veneer actually peels off in strips like bark off a tree. You've got to be super careful with it if you use it. Toward the end of my finish work, I started to believe that the polyurethane would be needed to help hold the crappy veneer together. All the more reason for more coats. If I had to do it all again, I just would buy the nicest quarter inch plywood I could find instead, maybe AB or AC.
As for the finish, I put three coats of clear polyurethane on it. An important tip is that it didn't start to look like it was going to look good until the third coat.
Funny: Yeah, it is kind of a funny idea and it looks a little strange. Did made me laugh too. That said, if you didn't know what it was, and you walked in and looked up, you would just think it's some kind of a bumper to protect your head from the difference in ceiling height. You'd have no idea that TP and paper towels were up there. But speaking of that, it does work as a soft bumper to keep you from banging your head on the ceiling if you're very tall.
Papaya (what Google voice dictation thinks is the spelling for Popeye), I like your paper bar as well. Unfortunately I can't use that idea because I don't have a dedicated toilet space.
Tom