So now that I made a witch and guard, I looked for a 10x8 board. I didn't realize they're hard to find. (One was $950 which is way too expensive for me). But after some searching I finally found a 10x10 board. It's an old draughts board, and the condition isn't perfect, but I think it matches my pieces. I can block off two ranks to use it for 10x8. Here's the complete bulldog setup (with witch and guard). I still have to make the black pieces.

Superchess pieces (plus some of my own handiwork) on a wooden Draughts board
...This guy's carved this shogi variant set out of wax resin...
Wax resin is a good idea - probably easier than wood.