Fitted and put curve in both landing gear outer plates, broke edges. Fitted and put curve in both center section outer plates, broke edges. Prepared all related gussets, curved and broke edges. Fitted and final drilled L/H lower longeron, dissassembled, deburred, primed. Re-installed longeron with clecoes. Fitted and drilled R/H lower longeron. Put radius in vertex of both lower longerons as per dwg. Removed R/H lower longeron, deburred, scuffed and primed it and floor skin where it mounts.