Don't worry Jazz, I'm having square profiled rails on mine.

Seller will build to what I want, but his opinion is 32mm screw rather than 25mm. He says 10000mm/min will vibrate with 25mm screw. Thisimplies 2510 ballscrew to me. There is no belt on the drive, so that rules out the simple double the pitch and use pulleys to keep the same motor speeds.

He also susgests that 3kW spindle is not powerful enough for 10000mm/min at 19mm depth anyway.