Completed drilling of lower aft wing skins, about 10 minutes. Spent the rest of the time leveling the LH wing structure, adding the lower skin, and drilling about 1/3 of the pilot holes to stabilize the lower skin on the wing. Washout (should be zero) is now established and locked in. Leveling was not a big deal. Put the level from the aft to forward spars at an inboard rib and outboard rib. Blocked up the aft spar until the level showed the same at both locations. Placed the skin carefully over this to not change the blocking, and drilled from there. My hand-hammered ribs centered up quite well on the pilot holes in the skin, better than I thought they might. Just passed 600 hours logged on the project.
