Absolutely stunning job, and exactly what I want to do with my own disc.
I do have a few questions, if you don't mind.
I can't tell 100% from the videos, but is this disc completely self-contained?
What are you running it with, some sort of PIC?
You mentioned that the inner disc was 16 SMT LEDs, how many LEDs did you end up using for the outer disc?
Again, I'm really stunned by how even the lights came out, and the smoothness of the animation. Thanks for sharing the videos!