I've had this idea for a while floating around and it'd be a huge undertaking that requires a 3D printer or such manufacturing tech, but would evolve the hobby and sell like hot cakes. Think of the Legos and K'nex toys either you or your kids played with. Why can't we make a similar system for kit/custom building small electric planes? There's so many combos that can be made by literally just having a stick fuselage that everything else clips or mounts to, in either a way similar to K'nex toys, or better yet, to the way optics and accessories mount to a rail on firearms. You could have either foam or film based wings and tail feathers that are interchangeable and can be slid and locked down to any position along the fuselage. The motor would mount the same way either as a pusher or tractor, with a slightly elevated version for high mount pushers.