Some more details:

• Choc switches (crystal reds)
• PBT keycaps from aliexpress
• Handwired (PCB possible, maybe...)
• Seeeduino XIAO SAMD21
• Built-in 15-degree tent angle
• Steel plate at bottom for weight and sound dampening, hopefully
• 4-pin microphone connectors to connect the halves
• 30-key layout inspired by Hummingbird

It's actually concave, in that the pinky and index are higher off the table, like in the Dactyl. It looks convex in the photo because the columns are angled outwards. The other photos might show this better. EDIT: I picked a better photo for the post to make the shape clearer.

Could call it the "sprinkler"...

Thanks! With that much stagger on the pinky column, and the pinky being significantly shorter, it just made sense to me.

Good to hear. Yes I will make this open source, hopefully within a couple weeks.

I get that, this design has been brewing for years with no visible progress until recently.

You're right, it wouldn't necessarily work as well with high profile MX switches, unless someone has bigger hands. Having only 2 keys on the inner index column helps to mitigate some of the extra reaching - but, that's not for everyone. Ideally there would be no inner index column. One day...

Interesting, thanks for playing along. I guess fingers vary here. If you don't get the smiley face for typing, I guess you prefer a flat board as opposed to a sculpted board? Do you see a similar amount of inwards angle on your fingers?