You have some very good advice already, though I haven't read all of the posts. I do have one suggestion re: the sinks. I can't tell from the drawing what size each of the four sinks are. However, it would be my opinion to put in one or two very LARGE sinks in addition to the wash sink. i.e. an 8' fiberglass or stainless sink. You could build one yourself (fiberglass) or have it mage locally by a metalworker (sheet metal/stainless).
In addition, a wash sink is good but you want a washer too.