RE: Throttle servo challenge
I ran into sort of the same thing as you. I am mounting a Magnum .91 FS in the nose of a Model Tech Formula 3D. It is very narrow and short. To get a straight shot with a push rod, I would have to drill a hole through the center of the fuel tank. That is not really an option so I went with a strange setup but it works. I saw a pic of it some where and just did what I thought I saw. I used a scrap piece of aluminum, nylon screw, some quick links. It may look ugly but works pretty well. It all fits inside the cowl so you never see it any way.
You can see I sanded down the mount ends to clear the cowl.
Dru.