Scale up to 80" and really impress the guys at the field. Mine flew fairly good, 2 flights with the mini Lazy Bee sitting on the wing and released in flight., before Katrina got hold of it. use yard sticks for wing spars and 3/16" foam board for ribs, 1/4" could be used without much weight increase. saves a lot of expensive balsa. might be foto's in the arcuves of RCU, I will look. dick