Right after my brother and I bought our BOL property we had a 12'x20' shed delivered.
Once delivered we insulated the shed and put up walls which we later pained white. Then installed 4 bunks which were fastened to the wall with hinges so they could be raised when no being used.
We then built a counter on the south side with a sink that when emptied the dish water ran down a pipe through the floor. We also installed a foot pump for water. The pump was hooked up to 5 gallon jugs in the winter and a rain barrel outside during the non freezing months. On the counter we put a cast iron 3 burner propane stove with bottle outside. Laid a carpet that we got from a neighbor who was throwing it out and installed a Four Dog wood stove.
Last we installed a solar panel outside on the south wall and a battery monitor inside; with three deep cycle batteries, five 12volt florescent lights and a radio hooked up to Sirius radio.
We lived in that cabin for weeks on end even when it was zero or less outside.
So it can be done.
PS: Socks helped during those single digit days to plug up the gaps around the door (s). [URL=http://www.smileyvault.co