Here's a design I did for "Age of War."
The initial thought was just a simple box with a divider for the dice, but it turns out the box is too narrow for 7 dice across plus the foam core.
So I built a little square for the cards, and left the rest for the dice!
___________Quantity_______Axis 1 (cm)_____Axis 2 (cm)
Place the 8.1 and 7.6 cm dividers such that they make a 7.6 x 7.6 cm square (measured inside-inside) in one of the corners.