I made a removeable tray for the rudder servo. I built the slot for the back edge to slide into, and the front edge is screwed to a brace that's expoxied across the fus.

This way, I can remove it to add a smoke system underneath later.

Mike

PS The tray IS mounted off center (it's the tray that came with the plane), but that is because then the servo horn would be in the center of the fus.