Yeah, the CXA posts are pretty massive …
One thing you might consider is making your own custom QC mounting plate for whatever you use. I bought a piece of iron from one of the online metal stores and made my own just because it was cheaper than buying the one from Tormach.
As it turns out my table surface was not parallel with the spindle axis. If you mount an indicator in the spindle at a right angle to indicate the surface where the QC plate sits and move Z back & forth my mounting surface had a slope of 0.0075” across it’s width. This means your tool post would not be perpendicular to the spindle axis. This measurement
IS NOT checked in the Certificate of Inspection.
So when I made my QC plate I adjusted it’s mounting surface to correct this and make the QC tool post perpendicular to spindle axis. I got it within 2 tenths across it’s width of 6.1”.
I used my PCNC1100 to thread mill the 5/8” threaded holes used to mount the QC tool post and the manual mill for everything else.