I made a custom box to fit all the PnP dice and playmats in.
To print this use A4 size paper and print set to "fit to page"
Well my computer is all in Japanese, but I think that is what the English version of Acrobat says.
I'll upload some images of my box later.
Make the box about that size with so room around the edges to fit all the components in. The box height is about 3.5cm which allows the playmats to sit in the bottom and the dice to sit in two levels.
The dice are 16mm so their total height in two levels is 3.2cm + the playmats w/sideboards on cardstock it all fits quite nicely.