Cap, I think I'm going to copy your insulation window panel system. That will also help me figure out if I actually want to remove any windows in the future.
Dred, I've been strapping things to the wall but never really gave thought to using the L-track for movable framing. I like it.
JA, it definitely depends on how you want to use it. Winters here aren't that bad, but if I were on a trip to AK I'd have to have a much better setup. I like your idea of moving to better climates and that's what this bus is supposed to provide.