That’s about the size of the tin cabins members of my family lived in at the Arvin Labor Camp (basis of Grapes of Wrath), also know as Weedpatch Camp or Sunset Camp. My aunt and uncle had 4 kids so they had 2 cabins. One was for sleeping and one was for living in. No real windows, there were pieces of tin that propped open. No air and they used a hot plate to cook on. No running water either. Had to carry it from a hydrant. There were community bathrooms and showers though. The tin cabin in the pics behind the other building is what they lived in. There were probably 100 of them all set in rows in the camp.
http://steinbeckcountry.sutromedia.com/weedpatch-camp-arvin.html