I certainly appreciate the need to align-bore an engine case when making an
acceptable job of a rebuild, I'm just not sure of the proper technique.
Perhaps someone could enlighten me.  Some questions that come to mind :
     1/ The centerline(C/L) of the crank must be perpendicular to the C/L of
the cylinders.  The only align-boring I've seen, on a VW case, was done with
a boring bar powered by a handheld drill motor.  Machinists call this a
portable boring rig.  Would the proper method be to use a boring mill while
registering the case to known surface?
     2/ I've heard as much as an 0.080" oversize used for the alignment cut.
Are bearing shells sized for this application readily available or is the
oversize accommodated in some other manner?
     3/ The same questions apply to the camshaft case journals.
     4/ Most importantly, who does good case prep work?
Richard