Clecoed the left and right HS skeletons together. Clecoed the HS skins in place. Clamped the HS-404 and HS-405 ribs in place and marked for the rivet holes. Removed and fluted the ribs. Clamped the ribs in place and match-drilled thru the skins. Match-drilled the HS forward spars to the skins.