So...with the curve in the roof line, I still have the problem of having square 2" thick foam but I wanted to try to come up with a way to add curve to my foam. I concocted a plan. Plan is to use 2 of my custom curved wooded trusses, spaced just right, lay the square foam in my form. Then, using this torch..I'll heat this Gibson guitar string to red hot. Then, using voice grips, we'll be able to pull the string through the foam and create the curve. I thought it was a great idea, and it might be with another kind of string, but the guitar string failed. It just kept breaking. I guess it was the heat. I'll call this a good try..but a no go. Maybe a piano string? Oh well, this show must go on. So I just added layer upon layer of thinly sliced foam. With the table saw, I was able to cut 6" inch wide pcs. Then, I simply adjusted my table saw width to whatever thickness I needed. 6" wide at a time, I was able to get a pretty solid roof full of foam. Glue was added to each layer..its thick and solid. At first, it was all goofy and uneven But after a few braces and an overnight smashing, it all turned out impressively flat. That's great, I like a flat sammich! Now were ready for the 3rd ceiling panel.