I've done quite a few on sxs's but they're made specifically for the model (Ranger 570, Ranger 500, etc)-and there are some differences
you will have to do some fabrication to make it fit your kubota
the EPS motor assembly is pretty bulky and it goes inline with the steering shaft that goes to the steering box. You'll want at least a 400w unit. 500w would be better, and you'll probably also have to upgrade the charging system-and it's charge wiring.
there is also the junkyard option using a Honda Fit EPS unit IIRC. Some of the local hotrod guys have used something similar on their older manual-steer cars, and it's slick.