When capital controls are in place and sending money abroad requires a bloody committee to approve, you try to make it right first time. Hence I see CAD being imperative in Argyris' case

The comment of "Beware of freely available CAD models" is spot on. Not all Nema 23 motors are the same, not all extrusions are the same. Luckily Misumi allows you to download their CAD files.
Best work to the drawings that tell you the expected tolerance.