Finished drilling the holes on the R/H wing root skin to a #21, except for the holes going into the front spar and root nose rib. Those I'm leaving until the wing is fitted to the fuselage. The spar gives a little bit side to side and I want to make sure it fits to the fuselage. I did end up adding a couple of holes on the leading edge by the slat attach bracket. The skin fits nice along the leading edge with the added holes. Removed the skin and attach doublers. The cut out on the bottom didn't line up perfect to the lower skin so I sanded it to make them line up. Also sanded a little bit on the leading edge by the slat brackets. Started to clean all the metal shavings.