Disassemble F23-07R Angle, -08 Fitting, -06 Web (all parts of -05R Mount Assembly) for shoulder harness attachment. Debur all, cleco back together on F26-02R Upper Longeron & F24-03 Upper Cross Tie #3. Rivet all. Rivet F24-02 Upper Cross Tie #2, F24-04 Upper Cross Tie #4 to F26-02L & R Upper Longeron. Drill #30 & cleco F27-01L & R Vertical Zee to F24-05 Lower Cross Tie #1. Disassemble, debur and reassemble. Rivet same. Rivet F27-01L & R Vertical Zee to F24-01 Cross Tie Box Assembly.