The mechatronics site is fairly new, but I think the author has been working on the machine for a couple years.

Benny Croonen (IIRC) who started/runs the plasmaboog group has been working on one for a good few years, with the group being a spillover from the EDM group run by Ben Fleming (I've got his original EDM book/plans).

I've liked reading the periodic posts regarding the problems faced. They're quite a complex machine that needs everything to work nicely together to get a good end result.

Is there any more info about your machine published anywhere?