I am using one servo for the elevator. I am using 2 wheel collars and I silver soldered in between the collars. I like the hangar 9 fuel dot, I found the fuelers that shut off flow to the carb when fueling are very restrictive. I am using a 2 line system but may be going to a 3 line because i do get some bleed at the carb when filling. congrats glow plug, Looks like the plane is going to be a good one.