OK, so why are you looking to change the fairings?
If you want to buy a pristine-looking bike, buy one. If you don't care, then buy a cheap one with cosmetic damage and just ride it. If you have visions of buying something cheap and fixing it up to be pristine, forget it because it will be cheaper to buy one that is already pristine. If you buy something cheap with the objective of making it pristine by using cheap parts, forget it, because the cheapness of poor quality will persist long after the low price has been forgotten.
It's different if you were looking at something rare-ish and you want to stash the unobtainable original parts away, or you want to build something customized (with the understanding that you are not going to recover what you spent on resale). But the bikes that you are looking at were built in huge quantities and are plentiful and relatively cheap. Just buy one that's in the condition that suits what you want ... Often you can find a good one for not much more than a basket case, in which case, it's worth paying the small extra price for the good one and forget about having to fix anything ...