Michigan's Paul Smith built this Giant Stunt Master "before your kit came out (and after Walt's disappeared).   Actually, it was copied from Currell Pattie's old GSM.   But it flies great, was autographed by Walt himself, and represents the finished product.   It's been used as an engine-tester for Fox, SuperTigre, OS, K&B and Enya.   They all work.   It's been entered in Old Time, Classic, Modern, and Profile Stunt, as well as a 100-Lap Sport Race.   My advice to GSM builders: Don't make it into a masterpiece of art.   Just built it light and strong and FLY IT."