1 hr fabricating the piece to hold the landing light wiring as it goes through the cutout in the main spar.  This will prevent the wiring from just laying on the bottom wing skin, which you don't want.

Using a spare piece of aluminum to cut out the pieces (one for each wing).

Using my trusty Andy Snips to cut out the pieces.

Finished piece in place (I buffed it smooth and rounded the corners using the ScotchBrite wheel on my bench grinder).  Only need to drill out the rivets from the spar, mark and drill out the holes in the piece matching the holes in the spar and rivet in place.