Okay, you're cool. I started a two-ring map (taking the seas down to the second ring of sapwood) on a piece of firewood with an exacto knife tip a couple months ago but haven't gotten around to finishing it. It's much less awesome than your table.

If you don't mind (because I'd like to try something like this in the future, and I'm curious)... What have you found to be the easiest and most difficult aspects of carving this?

Are you going to label it at all or leave it blank?