That's fair enough. To be clear, I wasn't specifically talking about a vertical monitor in the above post though. A 27", 4x3 horizontal monitor would produce a roughly 20" vertical display, with less wasted space than a 16x9 unit. I could live with that vs a dedicated vertical cab.
I think in the world of 16x9, 4x3, and 3x4 gaming, that a largish 4x3 display is the best compromise.
I've been looking at the cabinet kits from game room solutions, which are a nice but alas, are exclusively set up for 16x9 monitors. I still hold out hope that someone will scratch the itch I've got here, in a full sized cabinet vs the 3/4 scale.