I can/has been done.
AFAIK you need power steering pump, fluid resivoir, hoses, an additional drivebelt and also the power steering rack.
Bear in mind that the pump will be a ###### to fit as it is right at the back+ bottom of the engine.
Also, I have a PAS pump + bracket than I need rid of if you're interested 
Craig
P.S. I am not sure whether or not you will need any electronics relays etc. My instinct says yes as you always need electonic stuff, but I am sur that someone more knowlegeable will be able to confirm.
