Airplane Mod - Adding Ailerons

In the forum FlyZenn (Patrick) and I are having a conversation about how to modify his radio controlled airplane. It's a 3-channel model with rudder, throttle, and elevator controls. He's wondering about modifying it so the rudder servo could also control ailerons (to be cut in the wings) for synchronised bank turns. I've got an idea. He's got an idea. We're trying to see how it could all work. He's included a drawing showing his thinking on the subject. Come join the conversation and add your thoughts.

Also see: RC Airplane Control Surfaces