I think you are suggesting truing up the miter to be 0 degrees
(actually 90). That should be easy enough, but that blade runout is
going to bite me.

Getting the table (rotating portion) to be perpendicular to the fence
is another story. Near as I can tell the issue is the rotating table
is tilted slightly from front (high) to back (low). Thus the fixed
table to fence is perpendicular, but the rotating table to fence is
not. I cannot shim the fence, because then it would bring the fixed
table to fence out of perpendicular. The fence does appear to be
flat.

Truth is, with this cast aluminum (yes?) frame, there is going to be
quite a bit of flex. I'm curiuos not to take some measurments from
other saws.