Hello! I see that GameShell (or maybe GameSH>?) is open-source! However, there isn’t anything that points to the PCB designs. Thanks!
Is this what you’re looking for?
I’m guessing you’re referring more to a physical layout to acid etch to build your own using sources components.
Anyway, have a dig around Github. There could be something there. It’s almost like GitHub is the official source of information and progress, and the Forums are the platform to discuss things. So I totally understand your frustration re: not finding any more info!