@Radar this is quite something, I came across your project while researching doing the same.
I have limited space, basically leaving a board out for weeks, with pieces that are easily disturbed by cats and children makes it impossible to complete a game. So currently the game is gathering dust.
So I want to do the same. I have a board and prefer to use it vs a print, but it is thicker. I rested a random magnet in my house through the board and it does attract. I’d welcome any tips for the build.