The thought being to sandwich 1" XPS with 1/4" ply on both sides. Two reasons for this: First stability, then blocking to fasten to. Outside I have latches to be mounted and hopes of some sort of fly (Keder Rail) to be mounted. Inside, very possibly the upper canvas attached and who really knows what else will get mounted, but I do see at least a couple of puck lights.

This will be a rain day, so don't see much happening today, either the truck is in the garage or I work in there.. just not enough room for both unless minor. Ya, I try very hard not to take over wifey's side..