Last year I built an 8x8 cabin. It seemed small at first, but after living in it for a while, it now feels (relatively) roomy. I am currently playing with a 4x8 space. (It could work.) What do we need to do inside, anyhow?
SLEEP safely, and stay warm, i.e. shelter.
I am thinking a 6x8 would be perfect as a sleep shack. This is one of my next project experiments.
[Sleep safe, and warm]