As I previously wrote here http://faint-traces.blogspot.com/2015/02/first-attempt-at-quinzhee-winter1-ed0.html, I have been looking to sharpen my winter hiking skills.   The first attempt consisted of piling up snow, letting it sinter, then hollowing it out.  The results were positive, although I learned that a) you get soaked and b) to do it right you need a big pile and…