I built one waaaaay back in 1988. I used EPS foam covered on econokote and was powered by an OLD OS 40 FP. It was very light and flew very slow but opened a lot of eyes specially when I was brought it deadstick on final. Was a fun project and a fun bird to fly around but too big and cumbersome to carry. I did mine as a one piece unit. I am going to try to find old pics so I can post them. This are rough ideas for the main dimensions.