Nat I know you hate rust and think that wood is the death of a bus, but if the roof doesn't leak and they're not staying in a salty winter area there's no reason to be so picky about every detail. Most of the buses on here are twenty years old or more and are holding up just fine. Sometimes it's way overkill to do all the work removing panels when they wouldn't be an issue for another ten years or more.
My build thread:http://www.skoolie.net/forums/f11/build-thread-for-haulin-oats-and-goats-11237.html#post113500
A gal, a guy, three cats, two dogs, one rabbit, and one goat, traveling the country together.