Manual Elevator Trim Control
On the RV-8 my buddy and I are building we put the manuel elevator trim control down along the left side of the aircraft and mounted the control knob just to the left of the instrument panel (on the instrument panel frame). Making the 180 bend from the control knob to the back of the aircraft looks harder than it is, if you take the cable loose, run the control cable back to the tail, and then install the control knob in the cutout and hook them back together.
We are going to mount the contol cable for the pilot heat on the opposite side of the instrument panel frame (right side) and put in an air vent for heat to the passenger that blows warm air up over the pilot's left shoulder to the back.