RE: Throttle servo
I like them laid horizontal for elevons and for engine kill. It's nice if the servo comes with both style mounts cast into the case so you don't have to build your own hardwood side mount adapters.
You know how a harmonic flywheel [harmonic balancer] is built for engines.......that would be something to experiment with for building the ultimate vibration dampening firewall / engine mount for model planes. I'm not talking about that goofy design [with rubber stand offs] that allow the engine to wobble around at idle, but an aluminum backplate mount that has a rubber ring built in to seperate the inner part of the mount from the outer part that attaches to the plane. I have no clue how they make the automotive style dampeners..the inner and outer cast / forged iron rings must take huge presses to work the band of rubber between them.
This idea would take a lot of trouble to produce and the results would be questionable.