What are the Negroes' cabins like where Tom Robinson lived in To Kill a Mockingbird?

The cabins where Tom Robinson and the other blacks lived are little better than shacks.  They are all in the same area separated from the poor whites.  In the story, the reader gets a better description of the Ewell's cabin which is also little better than a shack but it is to be understood that they do live slightly better than the Negroes on the outskirts of town.  

These cabins would have cold in the winter and difficult to heat.  They were probably comprised of two rooms one in the front and one in the back.  One room would have been used to cook in and the other to sleep in.  There would have been no indoor plumbing or running water.