Whilst building a Pi-In-A-Gameboy shell mod that now seems to be all the rage, I was trying to decide what to do with the cartridge case, make it decorative only and claim some internal space, have it functional and hiding a USB flash drive... but then some fool [bracken] decided to suggest I read the original cartridges with the Pi and load them into the emulator.
and so GBCartSlurp was born and 2 years later it's almost ready to use