Well, this is my two cents worth: the Bloody Micks Fun Bat plane is about 879 billion trillion zillion times easier to build and virtually the same flying characteristics. It's NOT a swappable, however, it doesn't have the overly complicated wing with the support spar. It's just a simple, quick, and easy fold of the foam board one time, forming a KV airfoil wing. The entire wing and tail are ONE PIECE, so there's no weak joint requiring extreme packing tape. There's no overly complicated 2 piece fuselage. The ONE PIECE fuselage is easily tapered and runs the correct length from front to back. No guessing of you got it the right length or too far front or too far back. Don't get me wrong, I love the Bloody Wonder. But it seems to me it's just and unnecessarily complex and complicated way to build the very successful Fun Bat design, (which, by the way, also has free flans available that don't require the confusing and difficult modifications to print them into tile form!)