Disassembled the L.G. Assembly from the Fwd Floor Assembly to deburr all holes missing. Clecoed assembly again and riveted the Fwd Upper and Aft Lower braces to the L.G. Box Assemblies. Installed and torqued AN3 bolts to 35in/Lb. Used modified washers to fit withing the radius of the Fwd and Aft angles of the L.G. Box Assembly. Riveted the left and right mid cabin braces to the left and right L.G. Box Assemblies. Installed the two bolts that attach each Mid Cabin Brace to the L.G. Box Assemblies. (Changed these bolts to AN3-5A to allow for the Rear Passenger Rudder Pedal idler bracket installation). Torqued bolts to 35in/Lb.