The wood is 9-ply Birch plywood from Home Depot. We couldn't find any 13-ply. It's actually not really great wood - that darker strip looks ok, but there are small blue stains in a few places that we couldn't get out - not too visible in these pictures, but they are there. Being our first project, we didn't want to buy expensive wood. We used 1/2 round strips around the front to hide the layers of the plywood.
The cirlces were cut with a circular router jig we picked up at a local hardware store. It was very accurate. You basically drill a hole in the wood, insert a pin through the jig into the hole for a pivot point, and then with the router attached cut the circle (drilling slightly deeper every time you go around).
http://www.highlandwoodworking.com/inde ... rodID=4446
Most of the cuts are pretty straight, but there are some places where the wood doesn't fit together 100% accuarately, but it was good enough for what I needed.
All in all a very fun project. Kudos to my father for provided all the wood-working knowledge. Couldn't have done it without him.