Some more progress to report. I mentioned I had made a fiberglass reinforced copy of the blank-out plate before. I painted it to match the dash and fit one of the FM/MP3/USB/Bluetooth modules into it. The little screw cover plugs are just set in place as I do need to make an antenna plug, but you can see what this one looks like. As I said before, baby steps. The speakers I had ordered (from Mouser) got damaged in transit, so I'm awaiting replacement.
~ Jon 1952 1/2 ton with 1959 235 | T5 with 3.07 rear end