Throttle managment is the big think, flutter will destroy an airplane in a blink of an eye. I always seal my hinge gaps with monokote, reduces possibility. Move as much back, electronics, as far back as you can. Well, just don't tie anything down untill you get CG done, just kind of tac it down. Then move accordingly to reduce as much lead as you can. Thats all you can do, but the egine will be fine other wise, and yes, not prop clearence, like mentioned above.