Reply by Loren

Well, I think they would have more play in them. You can get
miter gauge inserts for router tables. That way shop-made
miter bars could be used or even the fancy metal ones that
are adjustable to tune out slop.

You could also use v-groove bearings riding on pieces of angle
iron. This is not unlike the sled built into Millbury tenoning
machines. My shop built 3 axis panel saw has the top carriage
mounted on 4 inch v-groove gate wheels riding on a piece
of angle iron mounted on an aluminum beam.