Rocker Switch Pros were great to work with. I strongly advise you not use their web tool and talk to them directly (or by email). They are very good at what they do.
Here is my panel in progress:
I did all of my own artwork, and I had to re-wire all the Carling switches inside to get the colors I wanted, and to make them drive a VP-X "pull to ground" signal while keeping the LEDs independent.
In hindsight, I would never spend the time and money like I did, but I sure am happy with my result.