I've completed construction of the control board, including scanning the bottom side of the board for shorts, cold solder joints, etc., as well as doing all the short testing recommended in the chart on the last page of the control board chapter.
The last two components to be mounted on the board are the two capacitors which comprise the keying shaping add-on to the board. It took quite a while to get C46 in particular situated on the board, so I thought it would be interesting to document how this came out:
The actual component for C46 was quite a bit larger than depicted in Figure 4-11, so the insulation bits needed to be a little shorter, and the leads needed to bent more squared off then in the figure.
Finally, I'm happy to report that I had installed RP2 correctly. Apparently, I'm the first person to ever write to Elecraft support after finding Figure 4-11 confusing WRT RP2 placement. Many thanks to Gary at Elecraft for helping me out with this today!