Sanctuary Tile Display

The sanctuary boardgame has a display made from cardboard and double-sided tape. if you live anywhere with or without humidity this board will immediately warp. To keep the pieces together I used 3mm Diameter magnets. This isn't perfect, but it works for my needs now. I may update how the pieces join, but there isn't a lot of room to work with. This is my first posted project, and I modeled it in Tinkercad. Suggestions welcomed.