So, I'm thinking about insulating or not - I'm curious as to how much it's needed. When you compare even the lightest walled teardrop to a basic tent, the blocking of air will insulate you pretty well. People who have uninsulated tears - how cold do you camp? And insulated?
Personally, I'm happy camping in a canvas tent down to about 0 F, with a good sleeping bag. My wife, however, has lower blood pressure and sleeps with an electric blanket 50% of the year; if I'm building the tear, it's partly to get her out camping with me more.
Henry