Insert for Hadrian's Wall board game

Inspired by Yellowban1s design I made my own based off the BIT system, which provides lids to the compartments. When the sheets for the game start to run out, there'll be more air in the box and things will not stay in place.

Print with the lid and the box will be lifted a couple mm, but after a few plays it will even out. Lid is optional. Lid fits (and stays) under the boxes while playing, so no need to save space for them while playing.