I'd have to say no to the Hallbach array. https://en.wikipedia.org/wiki/Halbach_arrayI'd like to focus more on the mechanical aspect of this all. Like I asked about. And also about the it being a hallbach array or not.
And a better drawing of your disc could get better answers to that question. You call it a disc but what Panic Mode showed looks more like a cone. I'm not trying to put you down on this but it seems to fly in the face of all I've ever seen about PM's.