I made a post the other day about this on reddit, but I finally got around to throwing things on github so I thought I'd make a post here too. I've had too much time on my hands lately and decided to do a custom pcb instead of a handwire for my next keyboard, but I thought a full keyboard was a bit ambitious for my first custom pcb. I shelved that idea, and started in on something a bit smaller - a numpad. I've been considering a Helix build, and thought the design would make a great numpad with a few tweaks.
The result is (hopefully) a numpad that can be built either left or right handed, with or without an extra column of buttons, and has per-key RGB plus an OLED screen. You can see the layout here:
Because of the RGB cutouts, the only optional layout is to Dremel off the outermost row and solder 3 jumpers. Switch spacing is standard 19.05mm, changed from Helix's 19mm. I've ordered a small batch from JLCPCB that just shipped out today, mostly because I was too impatient to see what anyone had to say first. I used most of the Helix's footprints and referenced it heavily as I laid things out. I've got the kicad and gerber files up on github, as well as some pcb renders if anyone wants to take a look.
https://github.com/bakageta/Chiral