Tom (the designer of the cheapino) sent me some parts to put together the keyboard after a few emails back and forth. The cheapino is a small, affordable 36 key split keyboard. It connects to the host via USB C and each half is connected with an RJ45 cable.
See photos of the build process (it was my first time soldering on a PCB, I had a cheap iron, and I didn't use flux, hence the messy solder joints):
The setup, cheap project mat, screw fix soldering iron and an Amazon soldering station. And of course some music while following the build guide.