Mounted the connector plate and D-Sub connectors to the Audio panel tray. Installed the audio panel and discovered that it stuck out of the panel about a 1/16". Removed the tray and filled the holes in the mounting rails to oblong them about 1/16" for a better fit of the audio panel. Reinstalled the audio panel. Did this three or four times until the fit was acceptable.
Spent time experimenting with a variety of possible wire routings for the audio panel to Navigator wires.