Not such on the original airfoil. Could narrow the aft fuselage like the FlyBike(?), or some of the really old-school attempts, before FAR 103. Obviously, I am open to doing it a LOT different than a strict copy. Stand-Off scale, cartoon scale, etc. I would prefer as light an airframe as possible and have several ideas to explore... This is NOT an aerobatic aircraft. Simply a for-fun flyer. I can think of several ways to attempt this without all this hoopla. Mind you, I asked about ply-skinned foam, right off the bat. I WOULD like help, if it's available. I freely admit I have a very limited knowledge of airframes and my powerplant school was in '81/'82.