Imperial, unfortunately.

• 26“ playing surface,
• 1-3/8” centre hole, 1/4“ deep,
• 4” from centre to inner circle,
• 8“ from centre to middle circle,
• 12” from centre to outer circle,
• 2“ gutter,
• 1/4” edge,
• Lines from 1/16“ to 1/8” thick,
• Posts 1/4“ in diameter.

https://boardgamegeek.com/thread/731671/postmortem-hilinski-method-making-crokinole-boards https://www.maydaygames.com/products/premium-hardwood-crokinole-board-2018-edition-beech

12mm Marine grade plywood is $60.65, Premium is $29.75 or $35.25. I don't know why the bigger piece of premium ply is cheaper. I think I'll just pick a piece that looks nice.

Many builds don't have two layers underneath the centre section of the board, rather they use offcuts to form the rim and glue it together. I think I might make mine out of two circles of thinner (10mm? 8mm?) ply glued together. This gives me continuous grain in the gutter, and is faster to build.

Soak it in hot water. Bend it around a round thing. Circumference is 2155mm, and I want two layers of this, so two 2.4m lengths. Cut both in half after bending. Offset joins 90°.

People also talk of ammonia for softening wood for bending. Sounds smelly.

I want two different colours, lighter on the playing surface and darker in the gutter. Either two stains, or just a dark one on the gutter.

Water based polyurethane:

• + Dries quicker,
• + Smells less,
• - Double the price.

Carnauba wax, no cleaning agent. https://www.bunnings.com.au/feast-watson-500g-mastertouch-natural-carnauba-floors-and-furniture-wax_p1565758

Buy them pre-made.

Vinyl tube over dowel pins.

I'll cut the lines in with the router, do a few coats of varnish, then fill in the grooves with some varnish whitened with titanium dioxide? Maybe?