My take is that it’s a magnificent tour de-force but the man was mad.
The effort involved to produce inevitably second rate machine tools is out of proportion to the results.
Objectively mountain climbing for the mechanically inclined craftsman, or craftswoman.
Fundamentally a re-hash of the pre WW1 and interwar years build your own machine from castings practice that was, at one time often the only way of getting an affordable machine of any capability. These days, for anyone within reasonable distance of youth, it’s hard to appreciate that even so limited a machine as the Portass S cost several weeks wages for an ordinary worker. Which would take a long time for working class family man to save up.
These days the world is pretty much your oyster with a wide range of machine condition and capability within saving up for a while price ranges. Ultimate aspirations may always be out of reach. Short of lottery win. But pragmatic usability tends to be within range.
Clive