I built a 12x20 A-frame in 1974 and lived in it a couple years. We slept in a loft that was the second floor. Half was open to the ceiling. I made light stairs that you picked up and rolled overhead to store out of the way. Flush toilet, electric stove, only thing I never got in was a shower. Old pot belly wood stove. Never froze the pipes and we went through the Blizzard of '77 in it. The temp stayed below 0 for about a month. We had a couple get togethers with a dozen people. My ex has some pictures. I have been meaning to go through the old pictures she has and make some copies. Will try to post.
What I don't think I got any pictures of is when I got some of my own property a mile away I towed it a mile down the snowy road. It was built on 2 pin oak logs attached like Lincoln Logs on the ends. I got it going with the tractor down the road about 10 mph and realized it might be taller than the phone lines. I let off the gas and the damn thing slid into the 3 pt. hitch arms on the back of the tractor. We did have to scoot some phone lines over it.