First, set the wing up so that the main spar was level and not twisted.
Dug out the left lower inner skin (the thick one, under the fuel tank) and deburred all holes and edges. Cleco'd in place.
Got out the leading edge skins; cleco'd in place.
Cleco'd the strut angle and double plate into position; had to file a relief in the fitting angle as I did with the right wing. Pilot drilled the doubler to the angle. Adjusted the upper edge of the doubler as it was hitting inside the upper strut tube flange. Clamped everything in place and located/drilled the A5 rivet that is slightly below the strut tube flange.
Removed LE skins and removed the strut fitting, since some rivets need to be set before the fitting is installed permanently.
Remounted the LE skins and got to drilling. First drilled all ~100 holes to #40, then to #30, and finally to #20. Thank goodness I have two battery packs!
Tomorrow or next time will be removal of the skins, deburring, and riveting the bottom skins.