[PeterisP]

Knocking the trackers off is a real issue, however, a great non-digital solution to that is the wooden laser-cut boards with physical notches for the cube slots - e.g. https://github.com/cophus/terraforming-mars-board and the many other options if you google or search etsy.

[failrate]

I tried to convince the publisher to add cutouts for pieces when they went to reprint an even more deluxe version, but they were unconvinced.

[ycombinete]

Probably because they sell them as luxury addons.

https://fryxgames.se/product/tm-dual-layer-player-boards-5-p...

[timvdalen]

The Ares Expedition version of the game does have double-layered player boards, works really well!

(I'm not sure how different the player board is to the main game, maybe you could use that?)

[erikerikson]

My cat sees your notches and raises a paw.