Thanks, but it's really not a consumer-quality product, and I don't think I have the engineering chops to turn it into one. The frame is made by hand out of plywood. A lot of the wires inside are just taped in place. The Raspberry Pi takes several minutes to boot up to the game screen, during which time you can't interact with the board in any way, and you just get a load of Linux nonsense on the touchscreen.

It's also extremely time-consuming to assemble because of all the wiring required for the magnet sensors, and if you short one of the power connections, there's quite a lot of binary-searching over possible joints before you work out which one needs fixing. I would not like to make another one :).

If you want to buy a commercial one you should check out https://squareoffnow.com/ - it has the advantage that it is actually a product you can buy, but the disadvantages that it has no clock display, no button to confirm your move inputs, doesn't support lichess, and requires use of their smartphone app.