Personally, I prefer legends only over icons only, and legends + icons over both. And the yellow capslock would be neat, alongside the colored codes, but the thing to think about is how many caps you'll need to add if you do that, yellow normal capslock, yellow stepped capslock, and yellow r3 control for the civilized fellows. What might be worth looking into is offering just the yellow on black keys in the base kit, keeping it nice and tidy, while offering all of the accent keys, the black on yellow ones, in a separate kit with the extra spacebars, so you'd end up with something like
Base kit, whipped up using my general compatibility layout
Accent kit, using normal accented keys, spacebars, and now capslock and code keys
Just a thought though. Also, I nabbed some pics of the 2 colors in question:
One thing to note, in person CV seems a good bit orange to me, sorta like the color of a school bus, yellow with orange influence. GE1 might be worth considering if looking for a vibrant yellow.