Cover the columns; isolate the metal frame; wood paneling
Most of the van interior will be covered in wood but some areas will be exposed metal. I found this guy who described how to cover the columns in the van: https://www.youtube.com/watch?v=rWV5kGyDb0Y I bought a cheap fleece blanket and used it for the first layer: I used a spray adhesive to attach it to the exposed areas. Then I used some denim weight fabric I found at Walmart, of all places, to cover the fleece. After adding the wood. We used tongue in groove 5/16" thick knotty pine paneling from Home Depot to cover the ceiling and walls. Initially we were going to run it front to back in the ceiling but realized we could do it without seams if we went side to side. Also note how we boxed out the small windows. There is a nice little shelf created. We've got some battery operated USB chargeable fans that we can put in those windows to increase air flow on hot nights. I used a similar technique to cover other spots that wouldn't get wood covering. Insulation is Havelock W...