Chinese Spindles

[JAZZCNC]

6'x3' steel frame, as an alternative i could use a chinese spindle geared down 2:1 or similar to drive a spindle cartridge.........

I wouldn't because the price of a 3HP 3 phase motor is so much cheaper and give far more torque done to very low RPM. You could gear it up if you need high RPM.
There are loads of 3PH motors in scrap yards and not silly money new.
To be honest I very rarely need over 10-12K but often would like the abilty to go lower than 5K which the WC 2.2KW just can't do and still be usable.!! Honestly these spindles don't have high torque even with a torque vector drive.!