Thats cool! I like the idea that with an R/C-plane you don´t have to fit in it after it´s done, that opens up some new dimensions!

Instead of building astructure of balsa and thenapply film to it, I´m building my backwards... If it will work I don´t know, but I sure will try!
Toclarify what I mean. I have turn my wreck (with some modifications) in to a plug that I have molded a thin and light fiberglass shell from.
I have made some balsa cheats with fiberglass on both sides that I´m going to create an X from. The shape I take from the plug.
In the front I will do a box for fuel tank and engine, that I will fit with-in the X.
This way I have a strongstructure to attach servos, wing and stab to that goes through the entire plane, but without having tosacrifice weight where I don´t want it.
The vertical tail will have it´s core from the same cheat that goes through (almost) the entire plane.

If it works out I can post some pics later on, that willprobably make more sens then me trying to explain it...