I have another question, are most airplanes including the giant ones, in regards to the framing is balsa pretty much it, or can you buy kits with other types of materials and what is the most common and best way to go. I am mostly interested in warbirds, My next project I want to tackle is an F6F with a 36 to 50 inch wingspan. What kit would you guys suggest. Hobby Lobby had a Guillows fit for $42. Also in regards to jets which is what I would like to do in the future, what materials do you use to build them? sorry for all the questions as I am pretty new to this hobby.