Yeah - standard winter survival skills...snow trenches, caves, etc. That's why I like having at least a torso pad as backup, especially in winter.
Smart man. As much as I love my hammock however, I still remember some quasi comfortable nights (only quasi 'cause I was an infantry grunt) in a squad tent(think tipi) at minus 40 and below. I'd have to say that when it drops below zero and stays that way, a Kifaru/Ti Goat tipi with a LW woodstove is the way to go. Snow isn't hard on your back to sleep on.