Do you make or has anyone tried to make 3/0 bearings
no, there is only room for bushings, but they work pretty well once you polish them out. don't forget to polish out the inside of the pinion gear and the spool shaft. that's where most of the resistance occurs.
Accurate plates...if you can find them.
I might be getting stainless steel plates for the Jigmaster, if those happen I don't see why the 3/0 wouldn't happen as well.Those will be expensive though :-\