duct tape the holes in the winter and when the weathers crappy :P
actually where those scoops are you should be fine, for one your not gonnaget much water in there period (unless you make a habbit of driving 50mph in reverse for any sustained ammount of time)
and the water that does get in shouldnt do any damage AFAIK
water gets in the engine bay, it happens all the time, just how much is the predicament.
oh and i'm down for Fiberglass as long as i dot get taken to the cleaners on the damn shipping