I managed to sneak into the workshop and actually get some work done!
I attached the rudder pedal slider bar (WD-818 and WD-817) to the floor and firewall. This was greatly complicated by the fact that the pre-installed nutplates seemed to have a mind of their own and did not accept the AN-3 bolts with anything resembling enthusiasm. I finally got it done with some Boelube and the help of a buddy. I think these nutplates will have to get a tap run through them before final assembly. I then drilled the attach bolt holes through the shaft of the slider bar and the weldment.
Next, I began test-fitting my Matco MC-5 brake master cylinders to the pedal assembly. The design of the integrated brake reservoir might mean that if I use them, I'll have to modify the attach-tabs on the WD-816 weldment. Either that, or I'll make a spacer and use a longer bolt. Not sure yet.