Interesting thread.
Yesterday I visited a customer, and expect to refit 1, later 2, larger (2.5 m long carriage) lathes with industrial quality retrofits.

The budget is likely to be around 15k, 18k with glass scales and or better screws.
Probably cslabs csmio-ips, and their sw, or maybe machx.

A 3 m long, 40 mm D screw, ground, c1-c3-c5 is not cheap.
Around 1 kW servos, x, y, maybe c (like mine), maybe B (tailstock).
The client is ready and has the will and the moolah, so ...

Itīs possible, perhaps likely, I can publish the refit.

The client is urgently looking for a big heavy large lathe we can do this on.
First xyc(b), and soonish linear guides (35 mm+) on all axes.

Very Large Lathes tend to be cheap, and are good moneymakers.
When no-one else nearby can do 50-60 cm diameter pieces, or shafts 3.5 m long.