But WOULD they work right? Have you showed this to Bob Carver? He's messing with the idea of a ceiling-to-floor ribbon array. He might have something to say about ribbons mounted so far from an edge - could be a problem. Or that you might do better with just a single ribbon.

How close are the topmost woofers from the ribbons? Looks awfully tight in the sketch, another possible problem.

But what a wonderfully fun bunch of problems to mess with!