I'm very happy with my G0602 lathe.
I designed and built a reverse tumbler gear set for my lathe. I've also designed and built a speed reducer for my lathe. You can see both mods. on this forum.
I'm wanting to either build or buy a quick change tool post. I've built a lantern tool post for the G0602, its I guess old school but works good.
The plans for the reverse tumbler gear set is on "projects in metal" forum look in general discussion for "reverse for G0602". I used a welder in a couple of spots but a guy should be able to make it work with out welding. The reversing gears are out of a small lawn mower engine and should be easy to find. The same gears are used for the speed reducer.
The speed reducer is built from home cast frames using small engine timing gears, home cast pulley blanks all machined on the G0602 lathe. I don't have plans for the prototype I built, as I plan on making it different, easier to build.