If I can rotate the disk sideways I might be able to solve the edge problem. Then I could just have a second camera that aims at the edge.
I could rotate it sideways with some static obstacles, but I may need a servo mechanism or something to do a 180 flip to get the back, unless I do the transparent glass thing.
The disk comes out, it whacks into a bumper and rotates 90° sideways, and three separate cameras photograph it at once, then something ejects it?