Looks like a nice job. The old saying goes, "if it looks good it works good!" really does mean a lot.
One small point that you might check on is whether you can get by with prying the switches out of the dash, rather than pulling the whole thing????
On my Vista, the switches have small "fingers on each side which makes it easy to pop them in and still if I get a flat thin, screwdriver tip under the lip, the switch can be popped out enough get to the wiring for what we might need.
I was going for a set of small digital meters to show start and coach battery voltage at different times and first thought I could go to the back of the radio switch as point to pick both items but it turned into a bust as I did not have complete enough info and when I got the switch out, I found the leads went first to a relay and I could not use that point. On my RV the two strings are in the same compartment and I finally found it easier to just run four wire 24 gauge telephone line from batteries direct to the meter I put next the the steering column.
I use it as a easy way to check that the mode solenoid and other parts are working.
A look at the start voltage and then the coach before cranking, then after starting, I want to see the start voltage go up as the alternator comes online as well as expect the coach voltage to pop up if the solenoid has connected them together! I used these tiny little meters and feel I get lots of good info for a very small price!
The voltage drop from long thin wires is no problem as all I'm really wanting it to know resulting movements, not an actual voltage!