Last year, Don, a little older guy than I, built a trench, more like a pit to me. He had an entrance and covered the hole with a blue tarp, anything like that would work. Step or two leading out from his entrance. He had taken one or two classes with the Sierra Club. His pack covered the entrance opening and he had a raised bed inside to sleep on, leaving a cold sink as the floor. Andy, just excavated a den for his dog and himself. To fit in, I just dug down a foot for my tent and piled the snow around the edges. Don has another trip with the SC this winter, no plans with us guys yet.