Don't ask why, don't advice to buy one.
Tell me how to build one.

There was a troll at a different forum and my thread got locked.

Anyways, with all the trolls put to the side, how can I build a commercial grade 5-Axis CNC lathe?

4ftx3ftx3ft is that a practical size for a 5-Axis CNC for hobby use?
Tolerance of +/- 0.001mm

How can I make the cast iron base from scratch?
Water cooled ball screw, how much do they cost?

What would be the practical steps in building one?

Thanks