Lori,

That cabin idea appeals to me. Rather more civilized than tenting or hammocking.

For tenting to -10F. I formerly used an old, 3/4 length standard Thermarest (i.e. no hollow cores, just 1" of foam) and for my feet a 3/8" closed cell foam Velcroed at one end to a homemade Thermarest cover.

Now that I got lucky and won a regular Trail Pro Thermarest in a drawing I think that's all I'll need down to -10 F. I do have a Ridgerest I can put under it if necessary. Amazingly my 10 year-old Thermarest Lite has kept me warm to 25 F. Hold it to the sun and you can see the lattice pattern of the foam. That 1st light matress had no fancy lateral coreing like they do now.

Eric