Beef up the fuse right behind the wing area a bit. The like to break there with even one hard landing. If yours came with metal landing gear screws, go with 1/4-20 nylon bolts. I tapped threads for that right into the wood block. (made it a little thicker on the inside though)

I maxed out the throw on rudder and elevator on mine, and it will do awsome flat spins now! It will hover nicely and has absolutely unlimited vertical with an APC 12x4 prop/magnum .46 engine.

Ernie