a way for you to play mahjong without a screen, designed to help you improve your solo mahjong game
the size is about 8inch lenght and 7.5 inch width and the tile insets are 1.45 by 1.07 inches with a wall height of about .15 inches so it should be perfect size for american jumbo tiles and you can scale it accordingly,
here is link to purchase the stl for the full tray - https://cults3d.com/en/3d-model/game/solo-mahjong-tray