Carlos, I have used metal pushrods for throttle and choke with the servos mounted at the bottom of the motor box without issue. In your pictures, the one thing that I did not like is one of the plug wires directly on top of a battery. I also do not use ignition kill switches because of the multiple times I have read about them causing issues. For the most part, being able to shut the engine down via either throttle, choke or external power switch has been enough. I have progressed closer to the 21st century and on my latest airplane have a Tech Aero IBEC installed so I can shut the engine down electronically. IMO your original problem is that the ignition switch was emitting some noise that your aileron extensions were picking up on. RF is a very funny thing and not always something that we could have foreseen. This is why for most practical reasons it's best to follow the rule of keeping everything ignition related and RX related separated as far as you can.