Of course you'll need some hardware built to make it work but we have now made the software part of this publicly available, and added much needed photos + block diagram of its current hardware iteration. There are also some analysis notes which will be compiled within this codebase: https://github.com/bookmanarchive/rom-dumper
It's not fully reliable yet, and we're still diagnosing some I2C bus issues that corrupt the received data every so often. The aim for a V2 of the hardware is to avoid these data integrity issues by going much lower level in the next month or so.
Stay tuned!