You know, I am bottling this recipe today: https://www.homebrewtalk.com/f78/holly-christmas-ale-145580/ . I tasted my hydro sample, and except for the lack of vanilla flavor (because it goes in at bottling), this was actually pretty darn close to Cold Mountain.
During the tour the guide mentioned hazel nuts as a possible ingredient, but everyone was tight lipped about the actual recipe.
I'm thinking of splitting up my batch at bottling and doing maybe 4-5 bombers with just vanilla, and the rest as the recipe calls for.