Hey there,
because i wasn't easily able to get the magnets Bmorr used, i remixed the design to use more standard round 5x2mm magnets.
Yes, you can see them when the box is open. Yes, it will not be as strong as the original, but i can hold it at the lid without a Problem when full of cards.
The magnets i have, were a really good press fit, i don't have used glue.
The author remixed this model.
I changed the type of magnets to 5x2mm.