This is awesome and I am now envisioning my own table when I can afford to buy the material.
One suggestion is similar to what IL said and that is to paint the bottom. Make it smooth and easy to clean and maybe even waterproof so that spills won’t soak into the wood. Also, when you set up a game you can put some stand-offs under the game board. These will raise it up, and with the plexiglass on top, the boards should be completely protected from the occasional disaster.
I speak from personal experience. A comment was made during a game that caused a fountain of Root Beer to spray from a friends mouth evenly across the dining room. Fortunatley he managed to turn away from the game and I didn’t have to unfriend him. Since then I have wrapped my older boards in clear contact paper.