After a quick reverse image search, this is Hunter Schafer.
According to where I bought it from and here this specific MCU shares the footprint with a pro micro with extra gpio pins
Here are the parts that I used:
PCB: Lily58 pro
MCU: Splinky rp2040
Switches: Akko v3 pro Lavender purple
Keycaps: Tuzi in XDA profile
With custom built cables, and just a front and back plate that I got along with the PCB.
Yvan eht nioj