Today, I began by preparing ribs HS-404, HS-405, HS-707, and HS-708. All ribs were then drilled as instructed. The entire assembly was disassembled and deburred. The assembly was then re-cleco'd and the HS-601PP skins were attached and cleco'd. The rear spar assembly was attached and cleco'd as well. The HS-708 and HS-603PP holes were enlarged to #21.