Hold a whole bunch of desiccant in your Polybox
This is a multi piece model.
Base, goes on the bottom
add section with no top attachment points would be a mid section, then ass section would be the top.
You don't have to add the no attachment point section, but it will take it all the way to the top of the Poly Box.
Then the lid, which attaches with 4x 3mm hex head screws.
The author marked this model as their own original creation.