I started looking at Cornwalls in 1969; the legend of PWK was strong even then. I finally purchased my pair in 1971. They are of the vertical format.
Never in a dealer showroom or at a Klipsch show did I ever see a pair put down on their sides, making the horns horizontal. Mine even came with rug-sliders mounted on the bottom. I can even remember a setup shot of the Cornwall doing its duty as a center fill between two K-Horns in the vertical mode.
I always assumed that Klipsch modified the Cornwalls to minimize production and inventory costs.
And yes, bring them back!