Looks like Kiwi and I are the only ones LATELY to check this out. While sitting at my computer screen, and with a tablet and pencil drew out your pattern. I quite liked the "finished" look of your final decision and thought I'd try to do a test block or two.
It is complicated!! I really had to study your photo and concentrate on where each color was situated. I used ABC and OXYZ, so not counting the setting triangles, that's about seven colors per two blocks. Wow - anyway, it seemed complicated and I wondered how you figured this out.
I really admire you for doing it. I'm not sure I'd ever even think of this pattern. But I'm going to give it a go. Using different colors, but using the same number of colors, and putting them in the same places as you have. I hope you will be able to publish a photo of the finished quilt top .. would love to see.