Thanks Ian at ? for email.
Making good progress. Don't think I will be using the digital connections on the back panel, but putting in the board. Also switching from the panel.
Rest seems pretty well being resolved. Need to find a good picture of the relay for the TX/RX LED connection.
And wiring the mic connector. I'll learn Arduino on an easier board. My first experience, and this is in place and seems to work. That's another lesson.