Start a 51% rule like there is in full scale home built aircraft. What else can you do without making this more complex then the space shuttle? The plane gets judged on its appearence and scale outline and details. The contestant must show photo proof that 51% of the work necessary to get the plane in its finished state was done by him/her. Now, what constitutes 51% ? That would depend on how much of the plane was "built" when it came out of the box, and what details were added that were not part of the original manufacture. I love to build, and it's a dying art, but there are just too many arf's out there to ignore them, there has to be a way to let them compete without taking anything away from what scale competition was meant to be. Many young guys today can't build, and that's a real shame, but the young guys are the future of the hobby and competition.

Ken