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Looks awesome!
I gotta get me a sheet metal buddy someday...
Maybe just some foam tape on the rails, except for the BBQ box, might take care of 90% of the metal-on-metal contact.







I would think twice about the sprayfoam. Almost every time I read of someone who has done this, they complain about the waviness and buckling of sorts that the exterior skin ends up with...
Jacob ,you may find if you want to follow the contours of the van walls . To use multiple layers of thin board . Were as a inch and a half board R 7.5 it won't bend much ,three half inch are easy to bend . PL 300 glue is made for foam and won't eat it like some glues . Also what I like to do is cut the board a half inch short all the way around ,and then spray foam around it . gives it a perfect seal and locks it in place. The build I am working on right now ,after the board is done I wrap the hole inside with Reflectic and tape all joints .The floors in your van are in great shape given the year of it .You might be right. This rig is going to get covered with Monstaliner, so it rippling might not be much of a problem, but I'm also considering iso board (glued to the outside skin with "Great Stuff".
This site has a bunch of good infos and I'm still on the fence.








I would use XPS foam. It has better R value when very cold.
Spray foam works, but note that anything over about 1.5" thickness will cause some thermal warping when cold/hot. The foam expands contracts a lot more than the steel skin, so larger panels will see distortion when the skin and foam vary significantly from the temperature the foam cured at.
I would also suggest not putting any wiring near the floor, especially up front. To much moisture...