NICE!
I personally would have hoped for one more R5 1U cap because my favorite 60% bottom row layout is "1.5U | 1U | 1.5U | 6U | 1.5U | 1U | 1U | 1.5U". Something like "Fn", "Pn" or "Code". But I can just use one of the arrow keys from my HAD and HAU sets for this. Going for double "Super" instead of "Code" is a good decision imo.
So it looks great, just not perfect, but perfect won't be possible anyway. Hope you can make this advance from IC to GB quickly.
Thanks, for doing this!