The Grand Chess people make 10 X 10 boards. They make the pieces too. I like there design of the Cardinal and Marshall. I'm going to get one of there sets soon. I eventually make some of my own too. When that happens, I'll post here and let you know. Seems like any woodworking shop that already makes regular chessboards could make what ever board size that you might want for a reasonable price. I'm going to think of a way to have the board interchangable so it'd 10 X 10 on one side and 8 X 10 on the other. That'd be cool for playing various versions. With a 10 X 10 board you could also cover up some rows and files for different configurations. It'd be a challenge to make a board like that that would still look nice though.