sugino V15 retrofit feasibility

Hi everybody
I have come across a sugino self center v15 with 4th axis with yasnac controls .which is available for sale .
it has SGDC 20 AJA servo drive. sysyem is not working , but drives may be.
Can this be a good candidate for LCNC retrofit?
what will be recommended board for this retrofit?

more pics

z axis servo motor

spindle drive

Your feedback will be much appreciated.
thanks
Riaz

I think this is the drive manual.
www.yaskawa.com/delegate/getAttachment?d...Name=SIE-S800-22.pdf

It appears that the drives use analogue voltage control in speed or torque mode, so should be a relatively easy retrofit as long as the drives work.