Basically a remix of a remix of a remix. The original is the Terraforming Mars Premium Inlay be Exaggerator. I removed the First player marker holder from my insert and that created some extra space in my box. I decided to use this space and increase the player cube boxes. Those magnetic boxes are a great idea, but I found it difficult to take the cubes out. Making them bigger and adding fillets helped a lot.
Magnets are still the same size ϕ6x3 mm.
If you're interested in the rest of the insert from my photos:
The author remixed this model.