X axis easy on rear side and will have to fabricate brackets, best done any way.
Y axis can be problematic for usability, often over looked even by the pros.
Would you really want something in the way, logic prevails.
If mount chuck side think about facing off, chuck may hit, certainly larger jobs.
On the other hand not fond of opposite side, tailstock interference and extended distance before starting the task with reduced travel.
Bright side looks like can attach out board with some bracing and specific bracketry, that's the only realistic way to do the earlier Harrisons, new ones easy with magnetic.
Have you the C type covers?
Do these glass scales screw on to a backing, easiest just need shims to align.
Whatever you do note the routing of the cables, again don't want anything in the way or interfering.