Mister-pete, it appears that Paul Jones's hobby is trying to make ------------------ "a silk purse out of a sows ear".
The Unimat SL was never intended to be able to create parts for NASA, as the ways are just those sloppy bars, a U3 is a far superior lathe to the SL.
Great that HE can get run-out down to one tenth of a thou, but what use is it when you try to make something, you'll never be able to hold your work to such extreme tight tolerances, as the lathe will NOT let you do so.

These Unimat lathes were never intended to be able to hold such tight tolerances, they were designed for just making bits for hobby work.
They are exceptionally good at making tiny bits for models, with quite reasonable tolerances, but nowhere near what Paul Jones is advocating.

If you want to hold such extreme tolerances, then maybe a larger lathe, that has been designed for such tight tolerances, WILL be in order. :-)