Foam works awsome. It is cheap, shapes exactly how you want it and it really speeds the completion of your project. This project is nearly done but my writing slows the posting process (not enough time) Here are a few pictures of what the copter looked like in the foam stage. I will get the full post up this weekend. I have used hardboard for builds in the past, I think I like mohagany door skin better. It seems to have many properties that make it easier than hardboard. Here are some pictures of the copter filled with foam and taking shape. All this was done in a few hours one afternoon. Very fast method.