I kind of shudder a wee bit when I hear of guys "shimming the spindle into tram". Is the factory so incompetent that they cannot even cut that surface correctly?
Might be a better time to relevel the table and see if the need for shimstock can be eliminated, since the shimming is going to be kind of crude at best since you are trying to create a wedge effect.
I'd also be hesitant to expect anyone but me to do the very best job on a rebuild. I've hired too many experts who did a half-a$$ job that I could have done myself without even trying hard. I'm not saying that there are no good experts out there, but they are difficult to get hold of, IMO.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)