I made a tutorial on Instructables about how to make an Atari 2600 cartridge, including the game design (VbB), burning EPROMs, soldering the PCB, 3D printing the shell and making the label.
Is a simple game based on Game of Thrones called "Bran, o construtor" (Bran, the builder) where Bran Stark needs to build the wall and fight the Night King (and eventually dies, like in GoT)
I left the documentation available on the Instructables page. I hope it could be helpfull to other makers!
https://www.instructables.com/id/How-to-Make-an-Atari-2600-Game/