Next cold management concept. In some class I took they talked about the mongolian method in the high deserts. Build a small "tent" inside a big "tent". Live in the big tent, sleep in the small tent. Here you would set up a 12 x 12 tent then pitch a small dome tent inside. Same concept could work for a made shelter. Wind break tarps are a form of this concept.
Igloo lore. My first igloo was on Mt Rainier. Igloos are always 32 deg at the inside edge of the snow. In time they thicken or thin to maintain that temp.
When we wook up (good nights sleep), it was -5 degree outside and +42 deg in the center of the igloo.
Ron Athay