Dont bother with changing a cab on an old cargo as any replacment cab you might find in brakers yards will all be wrotton by now, just buy a newer chassis cab of the same wheel base. If you can change a cab then you will be more than capable of swopping the body, the only difficult thing is if the body is coachbuilt into/onto the cab, but not imposable. You can pick up 2000 iveco 75e15's in good condition for under £2500 then allow yourself 1500-2000 for paint, panels and parts.
DB Transport, March 2011