Dirk Dieter, who lives in a single-family home on a sliver of land not much wider than the grass strip that parallels some sidewalks. His home, a few blocks from the Pacific Ocean south of San Francisco, occupies literally 250 sq. ft. He could use one of these designs, perhaps!
Of course one of the several weaknesses of these ideas is that when one function is in use, the other is unavailable.
Visit Steven M. Johnson at his website.