I can't believe it took me an hour and half to do this, but it did. After locating and drilling the additional 9/16" hole for the LEMO plug, I installed the pilot and copilot headset jacks - and the LEMO plug. I did screw up the paint job on the copilot side, so I'll have to fix that later. Also, a note to self; the LEMO plugs haven't been tightened yet.