i put p/p on the rudder and elevator on mine...had to do major surgery behind wing. i removed the covering on bottom behind wing and installed a hatch cover there also. after you remove covering just build a mount for your servo so it is inline and at right height for your rudder. biggest prob i had was routing the wire because there is not much room and seemed like everything got in the way. mine has a ys63 on it and i still have not flown it...work is holding me back