Hmm.. Still sounds like a lot of cable, surely stretching is a potential issue? Also additional belt reduction is another layer of complexity?
I would have fought that the wire would be able to rip the machine apart before streching becomes an issue, I'll have to check the tensile strengh of stainless (got an equation somewhere for calculating stretch)

Belt reduction isnt that much of an issue, some people use it on ballscrews anyway to reduce alignment problems with direct drive.

Sorry didnt realise it was a first machine, Im at the same stage, but converting a pillar drill instead so it can make the parts for the proper oneChicken and egg srings to mind....