New machine upgrade

Hi Guys

I heard this was the best place to get advice on upgrading my Boxford DUETi turn / mill. I purchased this machine last year and need some work done to it.
I bought a mach4 controller and would like to retro fit this if possible, I would appreciate any advice on how to do it. I don't have the bottom half of the machine as it was previously wired using a home made board and wiring, I was thinking of ripping out all the wiring leaving motor drivers etc.

i still have the big power supply unit that came with the machine however if possible i would like to use a more compact dc power source and driver for the spindle via mach4 board.

Thanks in advance for any advice