Hey there, not sure if this has been mentioned before, but consider dropping the R1 1u mod-colored \|, it isn't really necessary (the alpha-colored one is sufficient). Furthermore, you could also drop the numpad 00 key, since you don't see it used very often nowadays (except as an Alice B replacement, but you already have that covered).
Also, please consider adding R3 PgUp, R4 PgDn for us 65% and 75% users. I think HHKB users would also appreciate the addition of a R3 1.75u Control key.
Some legend suggestions: use Control instead of Ctrl, System/Sys or Super instead of Win, and Fn instead of Menu. You can change Num↲Lock to Num, Scroll↲Lock to Scroll, and Caps↲Lock (stepped) to Caps if you want all of the legends in the set to be single-line; it might look cleaner this way.