Looks like Mr S. was right.
Hooked the basic PSU bits up on the bench yesterday, to find a nice stable 82.7V across the cap :(
Now got a 0-50V toroid on order.

Not had much time to do much with the CNC bits, as I've had a few repairs to do, but should get some time over the next few weeks to make some more progress.
Have got the case for the control cabinet. It's a steel case from RS. so now I just need to source all the other bits for inside it.