Terragon Terrain Holders

Each column holds 25 Terragon Terrain tiles.  There are models with 1, 2, 4, 8 and 10 columns - Holding a max of 250 tiles with the 10 column.  

The 10 column Hex model has hexagonal cutouts to save on filament.  No need for supports on any of them.

Request:  If someone wants to create a cover/lid for the 10 column, it would be much appreciated!  This is my first from-scratch model, and creating the lid is beyond my skillset.