I have the airplane with the ZDZ 80.
I am not a 3D pilot so I can't help you there.
Throw the landing gear away and get something else. It has been formed over a sharp edge and will break at the slightest overload.
Back up the servo mounting areas. 1/8 lite ply is just not adaquate to hold servos with sheet metal screws.
Put a dowel in the forward aluminum stab tube to prevent it from coming out and having the stab rotate.
I think the ailerons should be static balanced even with two servo's per aileron.
Mine weighed 25#
I put both ignition and receiver batteries just behind the firewall and did not have to add nose wt.