Put everything together, although in a temporary fashion, and retuned the antenna from 20 to 40 meters. I ran out of time, light, and patience before I made any contacts, but that can wait for tomorrow.
The main things I learned are that the tuning is very touchy and has to be jogged back and forth to find the low spot; and that on 40 I have to go to the Lo-Z tap on the Unum. This was an expected result so I take it to mean everything is working.
Now I have to figure out a way to mount the switch in a permanent location near the radio so everything can be in its final place.