Quite some years ago I, over a period of a few years,
worked in a few darkrooms. During those years in those
labs there were no sinks such as this thread has as subject.
Sinks were of a size for washing up, mixing chemistry, etc.
Counters were used; my current has a 1/4 inch rise at
front with sink on left. For myself, I would not have sink as
is being considered. An expanse of multi purpose counter
is my choice. Dan