The driver is a Wild Burro Betsy. It will be a single driver design.
Wild Burro has a speaker plan on their website, but the design would be way too big of a horizontal footprint for my application. Essentially I was thinking about folding their 37" of panel width into an H-frame or U-frame.
Based off the readings, I can infer a few things. A flat baffle delivers the best frequency response at the cost of bass. The H-frame is the other end of the spectrum, offering better bass but produces larger peaks as a result. The U-frame is the middle ground between them.
I've attached images of what I meant by staggered sides on an H-frame. I'm not sure any of those articles addressed such a concept. Again, I thought that would satisfy a preconception that you want your driver mounted off center. Judging by the reading, doing something like this would alter the way it radiates, almost creating a pre-toed-in effect.
The thing I wonder about is the U-frame producing a cadioid pattern. That might actually be something of value, as I also have limited space between speakers and back wall.