Riveted SSO subassemblies consisting of supports, armrest supports, and rails. Then realized that would not work because the armrest supports cannot be in place when installing the seat base. So removed the armrest supports from rails. Also drilled out the double line of rivets from the forward cabin since I will be installing the center console option and it will be easier to get them out now than after the fuselage is joined. Cleco'd that area instead. Decided that the best order of assembly would be to just have the back support riveted in place until the gear weldements are riveted/bolted.