Okay, here's a crude sketch of that idea. He thought it would go good in a corner, and it could probably be constructed to be two or more pieces that then hook together.
I'm not saying it's a good or bad idea, as I want your opinions there. I was mostly curious if something like this had been done before. From my perspective (after all it's my friends idea, not mine), the only real benefit would be that only one PC would be needed. There might be some real-estate (floor space) savings if the monitors can be positioned right, so they don't bump into each other (flat screens maybe?).
Anyway, it's just an idea, so take it for what it's worth.