Carbon fiber. I have a neighbor, who was a technical illustrator, for McDonnell Douglas, later Boeing. He was amazingly handy and built entire cars from assembled parts, including making some from scratch. Metal, wood etc.
His son worked and sold skim boards, which were mainly from wood. Dad and son set about, to make skim boards from carbon fibre, and practiced in the garage. Alas they got it down.
Next dad made some needed body parts for his latest auto creation.
Son took up flying, and building planes for racing, etc. Now builds hi-tech planes.
http://www.aerochia.com/about_us.html
very cool, love to have one