I made this Dice Box as a way to carry everything thta I needed for a D&D session in a compact and organized way. The box lid is hinged and uses magnets to stay closed. The tray will hold 4 full sets of dice, your mini and has an extra slot for either a couple addition minis, small pencils or more dice. I left room under the tray to hold a notebook and pen or pencil. When the tray is pulled out, I use the bottom of the box as a dice tray. 

For assembly:

Screw two 2mm x 30mm screws into the hinges.
 

The place a 2mm x 30mm pin in the slot at the front of the lid, then insert two 2mm x 5mm magnets into the holes. your can pressure fit or glue in
 

Then insert two more magnets in the holes on the front of the box. Again you can pressure fit or glue in.