Match drilled and upsized 2 forward and 1 only rear spar holes on horizontal stab for mounting holes. Reamed to .249. Fit up of horizontal stab and elevator and attaching elevator push-pull tube so elevator can be set at neutral-- this will allow control stick assembly to be set at neutral pitch, that will allow AP pitch servo to marked and mounted at neutral position. Also test fit vertical stab rudder for first time. Marked and drilled AP pitch servo and permanently mounted.