I would highly recomend you buy a 450 clone like Tony said. That heli is super expensive and has a ton of plastic parts on it. i built a full metal and carbon fibre 450 clone for only 120 bucks!
If you make the wing struts long enough, ou won't have to get rid of the dihedral. Epoxy will make the motor mount stay on permanently. You'd have to lawn dart it worse than Tony to break it lol