I just had an interesting idea...
Take your case design. Use the thinnest possible plastic for the front and back. Make the corner bolt sink down to become flush with the surface. Place the deck spaces as close together as possible, perhaps a dozen per case.
Now, instead of being used for just display, they can also be used to compactly yet safely store your most delicate decks and the cases are stackable. With a little fiddling, you can even make them interlock to prevent tipping. Better still, create a rack where the cases can be stacked and held in place.
What do you think?
PS: why do all the measurements end in either 3/16 or 11/16 of an inch?