I really dislike re-posting things like this from other blogs, however generally when I am do I am vague and link to the blog that I got the information from. At any rate, I really love this look that was indeed used in the film-- the entire film except for the ending, we just never saw the face. It's the concept that special effects guru Stan Winston made up as the face of Jason Voorhees in Friday The 13th Part III. At the end of the movie, when the ending on the DVD was shot they opted for something less monstrous.
Throughout the movie Richard Brooker wears this mask, and you can even see a small glimpse of it when he is watching the cabin from the barn door, when he jumps down to kill Ali and in Chris' flashback.
Jeremy Bohr did a phenomenal job on this (but I still love Crash's version more) and is a steal at the price he is selling it for. Checkout Horror Bid for more photos, price and ordering information!