Part of the way through, I realized it was shaping up to be in octatonic mode (like my String Quartet #2), and thought of the title track of the KC "Red" album, which employs the same octatonic mode. Another connection that I didn't make until it was nearly finished (it took a couple of weeks) is the layered approach of my little Passacaglia sketch for string quartet from early last year (first 45 seconds, apart from the two-bar intro).
So, here it is -- inspired by King Crimson, although I have no idea what Mr. Fripp & Co. would think of it: