converting a tos/intos fngj 40

Hi,
I am owner of a fngj 40 milling machine, which i want to convert to cnc. First of course mechanically: the x and y axis are already converted to ballscrews. But the z axis seems not that easy to modify at first look.
Before i begin to disassemble half of the machine, i would like to ask you, if someone already converted such a machine, or similar (fngj, emco fb series, which are +- the same) and can provide me some fotos, or even only fotos of a disassembled z axis.
At the moment i am hesistating to disassemble it without knowing if its even possible (with reasonable effort) to modify it.
Thank you very much.