Card Case / Linkable Tray System

What is this:
This is my attempt to design a whole system of playing card cases that can also be used as pickup and discard trays. My goal was to have them both close with magnets (12x2mm) and link together with the same magnets. I am trying to design everything including the carrying case and mounting systems to be as universal for the different sizes of cases that already exist and may exist in the future. Ideally I want to be able to make and size case that uses the correct spacing of magnets that will work with this system.

Here is a quick demonstration of how they work: https://youtu.be/Y9nTbH9gu1o
The video contains a few different iterations of my design, which is why some have 3 magnets. I decided that was a bit much.


Break Down of the different files:
Inner \ Outer Card Case: This is designed to fit a standard deck of cards without any other case.
Inner \ Outer Card Case Sleeve/Box Compatible: This is a slightly larger version that should fit the deck of cards insi