I have not read a thread yet on moving the rudder servo back to the tail. Shouldn't be too hard to do. The most difficult part will probably be running the wires through the fusalage.

My friend and I built ours basically identical to each other.

OS 46FX swinging a 12.25 x 3.75 prop

Flying wires on the tail

Receiver mounted next to the throttle servo (cut out a slot in the servo tray, Rx mounted vertically)

Battery pack mounted on triangle stock above the elevator servo (all the way at the back of the compartment)

By adjusting the motor location on the supplied mount my friend's balanced dead on.

His flies great. I will be able to answer the flying question on mine soon.