Drew center lines on the bottom ribs and clecoed the bottom aft skin to the frame. Drilled out the ribs to #40. Added the fuel tank cover and tip skin and drilled the ribs to #30. Cut the flap and aileron hinges as specified and drilled them with the aft spar and aileron hinge doublers to #30. Flipped the wing over and drew centerlines on the top ribs. Clecoed the top skin to the frame and removed the plastic from around the rows of rivets.