I took it apart and took accurate measurements of the PCB, and once I reconstructed the PCB in 3D, I built a new shell around it from scratch.
There was a project that insideGadgets created which was an Action Replay cart called the GameXploit. https://shop.insidegadgets.com/product/gameboy-gamexploit-cheat-device/ I would love to see someone create a Game Genie clone.