So this is something I've thought of for quite a while. It's basically a replacement for Fort Frostmoth that has it looking more like a frontier outpost than a heavily supported legion fortification. It would consist of a large wooden palisade (rough logs, sharpened tops) with a rampart, maybe some lookout towers, a main hall at the back wall, and two outbuildings on the left and right side, probably a barracks on one end and the supply house/blacksmith on the other.
This was inspired by a few things. First, we have Skyrim coming out, so all things cold and Nord are hot. Secondly, the destruction caused at FF during the werewolve's attack is just unrealistic. I figure a wooden fort is much more likely to catch fire and fall apart if someone knocks over a lamp or drops a torch in the confusion. Also, FF is not like other forts in MW, I'm not sure if they mention how old/new it is, but it seems like it's fairly recent. Finally, the movie Ginger Snaps Back. If you are a fan of werewolves, movies set in earlier times, and hot Canadian actresses, and have not seen this movie, what have you been doing with your life?
In closing, I would say that I'm not asking anyone to build this, I'm just planting the seed of the idea so that anyone who thinks it's a cool idea might try it. However, if you would be willing to script the necessary dialogue changes (I'm guessing there would be some conflict with the quests as written and a new structural layout) and deal with any other issues of that nature, I am just beginning to learn interiors/exteriors (made my first shack a few weeks ago) and would be happy to try and do the actual building myself. I'm not sure what textures or blocks the game has for wooden walls, but I imagine the buildings themselves would be of standard Imperial/Raven Rock structures. If this mod were to be finished, I would hope to find some way to script a new quest wherein you are at the fort while it is under attack, and assist in the defense. I'm guessing it would replace the defense of Thirsk.
To whet your interest, here are screens from the movie of what I imagine Frostmoth to look like.
http://www.digitaldreammachine.com/blogimages/albertamovies/GingerSnapsBack_01_400px.jpg Inside the fort
http://www.thefleshfarm.com/gingersnaps/gingersnaps3pic29.jpg Outside the fort
http://www.horrorphile.net/images/ginger-snaps-back-emily-perkins11.gif Behind the wall
http://www.cbc.ca/arts/images/pics/darkhours3.jpg Werewolf attack!