I purchased all of the coins with the Way of Kings Leatherbound kickstarter, and wanted a simple way to display them all. It's a bit rough, but it works for me. The rings printed at the right diameter to snugly grip the coins. You can slide the rings into the tower, and then insert the coins. They have a groove in the bottom of the slots so the coins sit parallel with the face, but lift them slightly and you can spin to the opposite face.
The author hasn't provided the model origin yet.