Line thickness exaggerated for visibility. Just submitted for cutting on 6.2 mm birch plywood. Experimenting with a stencil system for numbering the backs (jig for positioning with spacers for centering single-digit numbers--that's the thing in the lower-right). Plan to paint backgrounds with watercolors and engraved areas with acrylics; spray paint for the backs. And lots of lacquer.
Each tile will end up about 6.9 × 3.4 cm (or 2.7 × 1.4 inches), which will make a finished 5 × 5 board 17.15 cm (or 6.75 inches) on a side.
