what I origanally wanted was
but i can't get access to it here in Yuma AZ.
so I am thinking that I can make a reasonable copy with covering both sides of dow corning pink 0.5" foam with epoxy/glass or epoxy/paper, then sand it smooth and paint it. thinking two layer of 4-6oz cloth type glass would work... or 4 layers of epoxy and paper (i know the epoxy paper sounds funny but it is very strong.)
Thinking it should be stiff, waterproof, and provide some insulation at the same time.
what do you guru's and much more experienced peeps think?