Depends what you use the car for.
When I was a mud seeker I had a pair of 16" Kenlowe's on the Range Rover, each configured to work at different temperatures with a kill switch inside for wading purposes - OK till you forget to turn the buggers back on ... these don't need a shroud of any kind.
General road use and laning the standard fan is fine - trying to figure why he would want to cut the shroud - what engine did it have before? - sorry if I should already know are you saying that the 200TDi fan won't fit??, if so why not buy a 200TDi rad and shroud ??
You can still use a standard fan when wading but it works like a propeller and drowns every thing under the bonnet this can be prevented with a grill / radiator mask but you need to get out the car to put it in place.