The seven π-18 bass bin is the same width as the midhorn. It looks great.I think the smaller sevens look cool too, sort of Gothic, like a large cross or something. Their look definitely grows on you. We really didn't spend much time with them when you were in Tulsa a few months back, 'cause we were focused on the two π's towers. So you'll have to check them out at GPAF, see what you think of their Gothic look.
But at any rate, the larger seven π-18's midhorn is the same width as the bass bin so it looks, as you say, like one flowing piece.