I found this template on Etsy and made it for my brother for Christmas. We always play dominoes when we have family gatherings. This is a Mexican Train set using 3mm Walnut. Turned out nice!
Be sure to test on scrap wood of the same material before starting your project. Using hardwood instead of hardwood plywood took some adjustments. Also, you might need to make adjustments to the slots for the domino holders. They may be a bit narrow depending on the size of domino you have.