HI: Although I do agree with DON ,I still exclusively use EVERGREEN.I find they are consistant in the quality and the actual thicknesses of their material. I bought some from another supplierNOT PLASTRUCT, and I found that a sheet of .060 was .058 in one spot and .062 in another. This definitely NOT work. If you write EVERGREEN. SORRY , I don,t have the address handy, they will send you a product and price list in one neat little booklet. I would suggest that you buy their book "WORKING WITH STYRENE" it has tips I find helpful even after twenty years or more of using their product. When you do the hangar deck remember to keep the deck "perfectly flat" and use plenty of support. You don,t want this assembly to weaken the hull in a very sensitive area. Warping can be a problem so make sure your decking doesn,t bind ANYWHERE inside the hull. you could wind up with a slightly out of true ship. I have seen this at shows so be forewarned. build your support structure in the hull seperate from the deck and then just slip it in. good luck and lets see some pictures if you can. tankerbuilder