The first thing I thought when playing The White Castle was - I need some kind of box to hold all the meeples for a more quick setup experience. If you want to see all bonuses you can just move the box around during play.
PLA, 0.2mm layer height.
Maybe print in player colors? Clear Filament? Have some drawing embossed on the top surface of the box?
About prior art: I've created this model on my own some time ago, I just found this thing (https://www.thingiverse.com/thing:6255497) that is somewhat similar, but just aligns the meeples on the player boards.
The author marked this model as their own original creation.
