He entered before I did!
Naturally, he had help (how else do you think he ended up in the photos?), but that doesn't stop him gloating at me.
Oh, yes, his Instructable is here.
(He's been playing Go at school, so he got inspired. I'd forgotten how good the game was. Actually, I'm slightly inspired by his ible to do a larger version myself - I just need a suitable box.)