More info via this link.
“Like most modular synthesizer users and builders, I suffer from Serge envy. Thankfully for all of us, Ken Stone licensed some of Serge’s designs to sell as CGS PCBs.
Here is my first module using these Serge designs”
The cat in the first photo is the “project supervisor.”
As another feline reference, “CGS” is “Cat Girl Synth”.