I have a WIP of a clamshell design I'm making for my Samsung Tab S2 8" tablet.
It's a clamshell design with a couple screws, washers, and nuts:
This is a picture of the front view without the black color applied:
If there is enough interest in this, I could modify this to fit the iPad mini 4. Then set-up a section in the marketplace for people to order.
NOTE: The reason it's still a WIP is because I need to figure out a mechanism to still utilize the power and volume buttons.