Drilled F-837 hanger and F-838 spacers and attached them to the floor. The control column is nice and smooth. Trimmed forward floorboards to fit around the control hanger. Bolted flap actuator arm and attach blocks to the the floor. The actuator was a bit stiff at first, but after I shot a tad of silicone lube in there, it loosened up a bit. Trimmed the aft floorboards to fit around the flap mounting blocks, and checked to make sure they can be installed and removed easily with the flap mechanism still in place (after all, that's the whole point of having removable floorboards, right?) Installed almost all the remaining floor nutplates. (To be precise, I installed the ones in the the F-805B L/R and their spacers.) I had to file the sides of a couple of the nutplates to fit. Not sure why that worked out that way. Marked, trimmed, and began drilling the right F-876 Aft Cabin Side Cover. Test-ran the flap motor using a 9V battery. Cool! Moving parts!