Nice job it looks good.First time I slept in the tent during a storm, no leaks and it didn't thrash around and keep me awake in the wind... Was quite pleased with it, I finally got a pic of it set up in the yard to dry after I put it away wet.
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.40 backed with 1/2 inch plywood. It's actually big truck box trailer roof I had left over from the teardrop build, I bought it off a roll at a big truck repair facility in Columbus OH