Just hardware. I was about 7; we took the tubing from an old TV antenna and fashioned a hang-glider frame. I'm guessing it was about a meter wide. We painted it and while it was wet, draped a dry-cleaning bag on it using the paint as adhesive. Coat hanger wire for the crossbar and a G.I Joe and it looked awesome. At first it flew badly but we slipped a skateboard wheel bearing on to the back of one of the tubes for a balance - nearly perfect. There was a big construction project on the hill behind us. From about 75m high it made slow circles for about 5 minutes before getting stuck on the school rooftop below. Super basic, but incredibly satisfying as a 7yo.