RE: Advice on Super Skybolt (engine mount and servos)
I have used the GP black nylon mount with my YS110 without problems. As far as servo's go, nothing special is needed. I just used a single servo for the rudder on this plane.
The key here will be to keep the airframe very very lite. You will need to put all the servo's as far forward as possible as this kit builds tail heavy.
As mentioned, there are a couple of build threads on this plane.