DarkArtist81
Super Freak
I was fortunate enough to win one of these back during one of the Spooktaculars. It really is great at showing all of the differences between the Jasons. I'm sure it has been uber-hepful for your customs Josh.
Oh HELL yeah... it is a great resource for customs, my masks are a million times better now that I have this book to go by. And I didn't have to freeze frame the DVD or go online for the Jason VIII head.