This latest project by Protieusz is called FOREVER-1, and the unibody split design with the hefty encoder and trackpad in the center was inspired by policium's GRIN Quern.
I modified it to become a 38-key keyboard with Bourns' PER60mm encoder, Cirque trackpad and RGB. Knob and Cirque support structure was provided by policium himself – Protieusz.
This design will be closed source for the moment. It may be released in the near future, but there are a couple of things that would need fixing: lots of wire soldering, RGB wire hack, etc. Everything works though, and Protieusz is using it as a daily driver: "Typing is pretty smooth and comfortable."
Update on 2023-11-19: Gerbers are now available.
By the way, the name FOREVER-1 comes from the song Forever-1 by SNSD (Girls' Generation), a K-pop band.
Resources
Github with Gerber files, QMK source code and photos: