my project build, need help please

[jpcnc]

Heres some pictures of a prototype machine I built last year which I am re-developing and building again.












The cutting head in the picture is just a mock up so ignore that bit, what I want to do is make the 2 axis run off a plc or simular. It is basically a lathe to reduce the diameter of the tyre. It needs to take around 4mm off in .5mm cuts.
Ive found a company on ebay that sells the rails, bearings and ballscrew/nuts at a reasonable price, can anybody recomend a uk company thats as cheap?
The main issue I need help with is the plc/cnc side of it. Ive been working cnc's for about 14 years now, but I havent got a clue how that side of it works? I already have orders for machines and need to get cracking asap, and bring it in as cheap as possible.
So any ideas are very welcome.
Thanks
Jason
www.jpcnc.co.uk