I was speculating on the construction of a "semi-permanent" or seasonal camp, something that could stand for several months but not more....

Essentially a structure that would substitute for a sizable backpacking tent....The attraction ---to me --- being something that could be practical and at least tolerable, in the colder six months of the year....(Where I live near New York City, this is maximum range of zero to 40 F.)

My friend suggested insulating the "tent" or "shack" with bubble wrap....I expect it might be feasible and effective.....but possibly expensive.... at least relative to using moss, or fallen leaves... or more simply and realistically double-walled plastic.... I am not really informed about reasonable alternatives.