Spads are planes made of coroplast. Costs about $10 to build a plane. He has a website called spadtothebone.com or something like that. Go to the spad forum and ask questions about them there if you are interested in them. I don't know much about them, but have seen a lot on them and they can make some pretty cool planes from plans. Its a cheap way to build. Quite a few people are into them. Just another option for you.