The Y axis is locked down and then the leveling table is adjusted with shims and screws until the Y shafts are level in both directions.
After the Y shafts were level I adjusted the Z axis shafts until they were level both directions.
The Z shaft bearings were then epoxied into the oak.
I am using bronze bearings on the ends of the shafts even though they don't turn.
I will drill through the Oak, through the bearings and lock down the shafts with screws.
I will probably use threaded studs and wing nuts to lock down the Rotozip.
I'll add a bit of metal reinforcement across the tops of the mounts to distribute the stress of the lockdown wing nuts.
Four wing nuts screw down to clamp the tool tight.
The two pieces bolt together and the tool holder can be moved up and down about 2 inches.
Update: The first piece my new machine cut was a new Z axis slide assembly.
I wasn't happy with the way the one in the picture above turned out.
I am going to program the router to cut a new Y axis assembly since the new Z assembly came out so nice on the router.