That's a pretty cool idea. Curious to know how that would turn out. Most because I have little understanding of how sound works vertically. Or horizontally...or at all really, but that's a different story.
Totally off topic, but, in playback there isn't really any 'up' and 'down,' is there? I'm sure I'm looking at this very simply (ignorantly) and there's a technical explanation totally over my head, but I wonder from a practical sense how vertically spaced mics sound.
Do you pan them left/right? That seems almost counter-intuitive, but my intuition is pretty limited in these kinds of things. Double the channels and blend both a little left/right? I guess I need to experiment myself, maybe with some cards as don't have omnis, but it does sound interesting....