Check out the original model and Boardgame Barrio's printable box covers.
I created a few specific game inserts for:
As well as two generic card game inserts, with one model having a a slot for instructions.
These should fit most card games. Each side of the card tray is 57mm x 88mm and is 25.5mm deep.
With instruction slot:
Without instructions:
The author remixed this model.