<<How would you add labels?>>
On my wood-veneer-covered panel, I have tiny engraved brass plaques as labels. Trophy stores engrave them and fill in the letters with black paint. They are cheap, maybe $10 or less each.
I also have virtually all switches with engraved labels (they are rocker switches). Pacific Coast Avionics sells those and will do custom labels. This way I need relatively few placards -- mostly for circuit breakers and push-to-test buttons.
It looks great -- im my garage...
- Rob Wolf