I completed the labeling for the annunciator lights and attached them to the prototype mounting plate to see how they look. The answer is: Nice!
I think, though, that I'll have to align some of the labels a little more carefully. I didn't notice until I looked at the photo that at least three of the legends have some minor centering issues.
My annunciator panel prototype. It'll look great once I cut the holes with a CNC mill.