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This might be a better starting place: https://github.com/jetty840/Sailfish-G3Firmware/tree/master/firmwarehttps://github.com/jetty840/Sa...

The reason is that the G3Firmware is probably closer to RepRap than the Mightyboard one and is more featured.

Also, if you go ahead with that, PM us and get in the loop, cos we can likely save you a few hours on certain things.