Ok I got some great feedback on my last post about the insulation and framing. Hopefully I can get the same for this.
For my floor I have worked with a material called Starboard. My plan was to use this around the entire perimeter of the floor coming in about 6-10 inches then use the marine grade plywood.
My opinion is that whatever you use, do it in full sheets. The sheets will give more structural integrity to the monocoque (however you spell that) design as a whole.
Theres a guy on YouTube that did starboard. Do a search for Airstream Valterra- you can find his channel.
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