Hi David.
I haven't checked this forum lately. You are the only person that seems intrested in this project.
I have an old Tower Hobbies Kaos 40 ARF, 7 years old and still flyable that I would use as a starting point. I would be using a Stihl 64 CC Motor That would require a 8.5" wide firewall to conceal the carburator. I have tried drawing a fuselage side rib and then scaling it smaller for each rib but you run into problems because the leading edge radius shrinks too much. I need to keep the leading edge radius constant, (.6875) or whats commonly called 1/4 round. The wing panel needs to have a 1" diameter wing tube hole drawn on each rib at the CG. The main spars need to be 1/4" X 1/2" centered above and below the wing tube hole. The ailerons are the easiest part once you have a true center line. I want to keep them as small as possible so as not to induce flutter. This would be a high speed airplane, not a 3D airplane with large ailerons.
Still interested?
Larry