Completed step 3 page 10-07. Finished riveting F-1281L to F-1282L. Completed steps 1 and 2 page 10-08. Turned assembly upright and clecoed F-1211 assembly to aft end of existing structure. Completed step 3 page 10-08. – clecoed F-1280R and F1280L side skins to frames and assembly