Really cool design concept, we need more authentic retro cap designs. The centered stepped caps in particular are amazing!
However, the legends are just not quite there for me on this one. No 1.5u Backspace is a bummer (should be standard by now). The upside down legends, while interestingly functional, just turn out to be somewhat limiting as far as aesthetics/colors (and kinda messy looking). Also, I feel like there's a missed opportunity here to color-match the layer color with a corresponding "FUNC" key legend of the same color. Lastly, there's no need to have branded legends, it just look tacky.