I think its happened before, Furry may have done it I can't recall.
I'm in the process of trying to do it in wooden at Providence. 20-4 #1 RPI, I have 3 juniors, 4 sophomores (actually 1 of them is a junior, but was ineligible his first year so i think of him like that), and 5 freshmen (one of which is ineligible).