Update: Added captive nuts for all the mounts. The ballnut mount captive nuts will need to be slightly grinded on the inside. If you look at the model you'll see what I mean. The 1/4-20 nut in the middle will need to be the thin type. There's just not enough meat on the model to use anything else. They can be found online easily.
I converted Russtuff's G0602 conversion models to STL files and then edited them to come up with a 3D Printed version. If you're checking out these files, do yourself a favor and head on over to his youtube channel. He has A LOT of useful videos on the G0602 and G0704 CNC conversions, as well as CNC work in general.
Russtuff Youtube Channel - https://www.youtube.com/user/russtuff
Russtuff Original Design - https://grabcad.com/russtuff-1/projects
Models used with russtuff's permission. Original models converted to STL are included.
Not yet printed or tested. Conversion involves other hardware, namely ball-screws and mounts. No idea how well this could work, but I don't see why it couldn't if you had the other hardware. Without having the G0602 yet in front of me, I can't tell if it'd be possible to use the motor mounts with the stock lead screws. Anyway, obviously the 3D printed files are different than Russtuff's version. I combined components to make the 3D printed version simpler and more rigid in plastic