Hi balloonbandit
Each of the two wings is made of 2MM Coroplast, with the flutes running cord-wise. The three struts with ribs, and ailerons are made of 4MM Coroplast. Are you going to try to build it? I have two friends that plan on building it soon. I'm anxious to get another opinion on my method of building the two wings so they end up parallel with little added effort. One of these days I will put a sunburst decal on the top of the top wing. Our club has our yearly Chili Fly-in tomorrow and I'll be flying the biplane in the morning and afternoon. So far no snow to test my new skis on it.