Good job Scott. It was interesting to read that you haven’t had any moisture build up on the inside of the structure, either on the inside walls or under the roof. When I built my
portable hutch, I had to use a sheet of 3mm closed cell foam as a liner for under the roof flap, as condensation sometimes formed on the underside of the canvas and would drip onto the work surface if a wind gust flapped the material. It looks like the hollow core cross-section has some anti-dewing properties!
Cheers
Dennis