Continued to consider the assembly order. Became concerned about adding the extra weight of the TCW battery backup to the rudder bar center support bracket. After discussions with John, pulled on the end of the center support with about 12 pounds of force (extra weight is 34 oz spread over whole bracket). Didn't see any deflection pulling straight down at 12 or even 20 pounds. The bracket twisted slightly if pulled down and to the side where the backup battery will be mounted. The twisting was much smaller if the nylon support blocks were installed. In all cases, there was no significant change in the friction while moving the rudders. Drilled holes and installed nutplates on the rudder bar center support to mount the TCW battery backup. Considered installing PEM studs or using nuts and bolts before deciding on nutplates. Drilled and dimpled holes in the firewall recess. The recess box must be sealed and riveted before it is installed in the firewall. Decided to dimple both layers at the same time instead of unfolding the part enough to dimple each layer separately. Researched brake line fittings and ordered Legris 3109 56 11 push to connect fittings for master cylinder to brake fluid reservoir connections. These are fittings in the same family as the fitting Van supplies for the brake reservoir.