I have started gathering parts for the Too Rolling (Red)Stoned. I had wanted to use 8" diameter x 1" thick styrofoam rings in place of foam board. They were a bit over a buck on-line but Michaels wanted something like 5 bucks for them. So, I settled for poster and foam board. I got mostly white poster board but also a sheet of black. The thinner foam board has black on one side and white on the other. This should make a nice roll pattern on the fins. I have no plans for the upper roll pattern or 'United States' lettering. I don't think I'll dedicate that much printer ink and, on an 8" rocket, buying them would cost more than the rocket itself. I also cut an 8" base plate and a couple of 29mm-4" centering rings. Oh, and I got a roll of white duct tape which I'll use on the poster board seams.
I went through many options for the replaceable fins. Most options involved too much plywood, which defeats the purpose of building with paper and foam. Not that I'm a purist, but wood will jack up the weight. Right now, I think I'll make some thin plywood slots on either end of the fins and will keep them one ply. I originally was going to go with three ply for a more scale-like form factor. Using one ply will make them more prone to damage but should also be easier and cheaper to replace.