Yeah it's actually pretty impractical on second look. I have, however seen rc prop planes, some fuel types, and I believe some electric,with a highly forward swept wing that starts way in the back. As for what holds the nose up on these? Canards. The best that could probably be done is a modified version loosely based on that picture with canards and larger control surfaces. I'm learning new things all the time, and will have better suggestions as I go, but as far as the modified version with canards, that would probably fly well. It would probably fly without canards, just with larger control surfaces, possibly slightly longer wings, but I believe canards would really improve the performance.