Hey Marc not sure if you saw my latest post so I figured I'd shoot ya a message as I'm considering moving on this bus and there's another potential buyer in the wings. Let me know what ya think, thanks!
Here's what he said about insulation "I peeled back the skin and the original fiberglass insulation was still pearly white, so I left it and added 2" foamular on the walls and floor. The roof is still original fiberglass. There are 2 x Tristar MPPT60's so yes, solar could be expanded easily. I doubt you'll need it though." Planning on going to check it out later today if you give the all clear on the build/price tag! I think the primary cost here is the extensive solar array on the roof, I put the link to his forum add below.