Ok, right step-by-step is what we're going for here, so this is what I've done:
Floor: Laid several 1x4s as furring strips and used some spray adhesive to place a layer of reflectix and 1/2 in sturdy foam insulation between boards. Two layers of reflectix and some duct tape over the wheel wells. 3/4 in plywood screwed into those furring strips and I now have a sub-floor!
Walls: I started to remove the side panels and found 2 in foam insulation already in place as part of the stock options. Got my hands on some Gap and Crack spray foam insulation filler and did my best to create a mess while spraying away at all the open spaces I could reach. I then spend the next week furiously exfoliating this gunk off my hands. Next time; gloves.
Ceiling: There's an auxiliary AC in the rear of the bus blocking the very back ceiling panel from being unscrewed. Unfortunately, the way the ceiling is installed, this panel HAS to come out first. So we propped that AC on a latter to lower it out of the way without having to completely disconnect it. We spent the next several hours carefully working around the latter levitated AC trying not to knock it over. There are a lot of screws in this damn bus, and now a good number of them are stripped and ragged looking... oops.
With the entire ceiling removed I adhered a layer of reflectix to the roof and replaced the already existing 2 in foam on top. Gap and crack again, with gloves this time, and then reassembled. The most frustrating process was lining up the pre-drilled screw holes between the furring strips and overlapping panel edges. I won't say it looks good as new, but it is at least back in one piece... mostly.
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