When I built the Tak set, my focus was really on the pieces (after all, you can play without any board at all). But the pencil-on-butcher-paper board wasn't very nice. So I built a new one:
It has 2" squares with lines in pen. The colors are watercolor on unprimed, natural canvas, and I'm really happy with it. I was going to finish the edges, but I kind of like the lightly frayed, well-traveled look, so I brushed a tiny amount of Mod Podge around the edges. That should arrest the fraying to keep it looking lightly abused but not ruined.
Go check out their kickstarter and get your own Tak set as soon as they're for sale!