I really am tired of designing my own stuff and want to build one of the park jets that I bought the plans for. However I do not have access to depron locally, and I really dont want to pay the extra $$ for it. I have lots of $tree foam and want to use it. The thing that stops me is that in all the print outs there are a few pieces that are too large for the 20x30 sheets of $tree foam. How do I do this without making my plane weaker because I have pieces spliced together?