With due respect, Why?
Again, what sort of so called Unimat are you refering. At my last count, I got to 4 and there was a a couple of clones. One of which is the MJ-289.
Having said all that, I have a MJ-289 and it would cost you or me considerably more than what I bought it for- just to set up the mould for the bed alone. Then you would have to cast it, then part machine it, harden the bed and finally slideways grind it. That pretty well reflects the later models of the Mark 3 and 4's.
As for the original ones with round bed bars, these are usually die cast alloy- and extremely accurately line bored.
Going back a bit, EMCO made the lathes for inmates of Dachau Concentration Camp- to make the V Weapons used to attack the UK.
I have several reminders of such momentous events. I'm - what does one say- curious.
Norman