I have a critical note about your idea.
I don’t want to be a party pooper here, but your monster request looks almost exactly like the sand monster in Dune; http://www.ew.com/ew/gallery/0,,20171850_7,00.html
Type ‘worm monster’ in google and you get zillion of these type of monsters, not really an original idea IMHO…
Remember The Thing? The head that got loose of the body and transformed into a spider, with that serpent-like tongue? That was freaking original and unexpected. Alien; Giger art, awesome creature, something new, dirty spaceship, set a standard for most of todays movies. That was quality and not done before. Something that lacks 99% of todays si-fi movies. They all dig from the same idea-box, we have seen it over and over again, boring.
Not that I doubt that a quality 3D artist can make this look beautiful, artists can do that, but that’s not my point. Be original with ideas. When I see that worm popping out of the snow I think; Dune.