On page 9, they have two stereoviews that don't match up well but the one on the bottom when fused shows the entire scene, albeit with not that much stereo.  I'm thinking one could accomplish this same effect with a pair of 6x9 cameras (or even 6x7 or 6x8) and cropping the image down to 6x6.  I might be interesting if you had a lot of depth in the middle you were trying to accentuate with both of the side panels completely flat.

Steve