I recall you could pick the window manager yourself (there were more than one available, if I'm right, unlike today)..sawmill or sawfish or something? IceWM? Can't really remember - sorry
I think I had RH6 install media here some months ago..but it just happened so that I threw it away, as it was on an old cd-r that just consumed space on the deck. Had you asked before that incident, you had got your answer quickly..