Today, I made some really rewarding steps forward:
1. I installed the foam-core test panel in order to verify the placement of my avionics, clearance from the attachment flanges and other installed items, planned wiring runs, and general ergonomics issues. I noted that there are three nutplates at the top of the panel that will have to be turned 90 degrees and replaced with stubby versions in order for the GRT EFIS screens and the Monroy Traffic Watch unit to be installed in their planned locations. I will also have to cut away a small amount of flange in a couple of other locations. None of these is a big deal, and it's great to know about the issues now instead of later. My next step is to install the actual avionics boxes, one at a time, to verify clearances from the bulkhead and support structure behind the panel. I don't foresee any big issues.
2. I also clecoed-in the side switch panel, with the switch template taped to it. I had to verify that the switches will be easy to reach, and the labeling will be easy to read from a normal sitting position. Everything looks good.
3. A while back, I located a neat switch plate and lever for my flap switch, and today I assembled it to verify the ergonomics issues. I like it better than the layout I had previously designed.