The layout looks awesome, it should be close to the siig as possible, but with a full function key row. Also possibly with the function key swapped with the control/alt keys. There was a lot of complaint with that originally from normal people.
If you can give me flat black caps with red lettering, it'd be my dream board totally.
I'd like to see the board mounted with alps as well as cherry, alps won't be easy to do without a mounting plate to keep the switches straight. I had that trouble with my minitouch pcb. I had to fashion a plate for the main keys, cause they get all wobly and out of place without one.