Protieusz shared the case and Gerbers of the LeBallz, a Le Chiffre derivative with a 25mm trackball, 34 or 35 keys, and an optional EC11 encoder.
Specs
34-35 keys (5x3+2 per half)
MX, soldered
25mm trackball, PMW3360 sensor
RP2040 Core A controller
optional EC11 encoder
Changes
The PCB DXF was extracted from sporkus's case step file. It uses MX and EC11 footprints and is powered by an RP2040 Core-A instead of STM32. Designed via EasyEDA.
PMW3360 trackball sensor footprint added.
Top case modded with a large circular cut-out for the 25mm trackball holder, friction fit sitting flush with the PCB with the sensor underneath it.
Two top case variants: One for the extra MX key and another one for the EC11 in the center.
Bottom case modded with MCU cut out so that the 3mm board doesn't rub the bottom case.