RE: Dago Red Elevator Mod
Well if your talking about the WM,not much room. On my Midget, I widened the servo slot, put the rudder servo in the middle and separate elevators on each side.
I have a few of the regular 40 size P-51s. I just get a high torque servo, a decent dowl and make myown and run a "Y" out the back. Works fine.