I am using a rcexl box guess I will pull the fuel tank and see where I can mount it. As far as the reciver and servos they are back where the wing blots are and the throttle severo is about 18inches from the fire wall. I am using a nyrod with a plastic ball socket on the end for the carb and a rod thru an adjustable keeper on the sevro arm. I am woundering if I can cut a hatch in the bottom under the fuel tank and mount the box there? Then I would not have to drill a hole in the fire wall sort of a half circle for the wire to come out sense the engine is mounted inverted I plan on putting the box and switch and battery in the fuel compartment so what do you all think michael