@guyrocket Well, for the arduino part, the github link i provided should cover most of the required info.
For the actual box, i was going to follow one of these 3 projects:
bambooarcade.com (down for good but it's been backed up by archive.org)
Actually i just found out another project that could replace DaemonBite: https://gp2040-ce.info
I think the general instructions are pretty simple: it's just a matter of flashing the software on the board of choice, wiring everything as per the diagrams and shove everything inside a box (cardboard, ikea plastic boxes, wood, 3d printed cases... there's plenty of options)