I'm in the process of building a rv12is and working on finishing up the tailcone. I primed all the internal skin surfaces and bulkheads with SEM which to my knowledge is not conductive. I plan on installing a garmin magnetometer. Looking at the overall plans, other than the magnetometer and servo, there seems to be minimal electrical / electronics in the tailcone. I'm aware that the rv12is is a negative ground airframe. My questions to all you experienced builders - Do any of rear electrical components in the tailcone (and rearward) ground directly to the airframe similar to what you would find in an automobile which would require carrying a good electrical ground throughout tailcone assembly? Any advice or insights that you can provide will be greatly appreciated!