""""I will tell you, grooves will have tapered sides, threads will be at the wrong angle and parting off and drilling/reaming will be a tool smashing extravaganza.
You can program out tapers in faces and in diameters but coordinate rotation can not fix this. Lathes must move parallel and square to the spindle or you are in big trouble.""""
Graham, we are taking a few hundredths of a Millimeter in Diameter over a length of 300 Millimeter here.......( sorry not so familiar with Inches)
And Yes, the accuracy of re-fitting the unit, is an other concern.
Still i wonder, how you compensate for the alignement-imperfection of your own lathe ?