Once again, excellent job on this one! Bravo!
You've really made me look for some of those levitation globuses or same stuff to put their magnets to the good use to
On the rotation. I can be wrong, but as I understand the physics of this process, the model rotates when it's extricitet does not align with it's mass-center. That creates forces, that are always trying to make such alignment, thus causing the model to precess around the axis going through the mass-center and besides don't let it fall on one of the edges. So, rotation can be avoided if needed, if you put the model over the magnet super carefully, with it's mass-center located right over the magnet's center and with the constant magnet inside the model located absolutely horizontally. Again, guys, I mght be wrong, don't take this to serious, I haven't worked with such stuff myself yet!
P.S: This looks like a nice show overall. If You know the source of some pics, showing other presented models, or maybe made them yourself, could You please share them, Benjamin? That would be of an interest to look at to