Splitting walnut is really nice. It almost falls apart. You can one-hand it with a hatchet pretty much.
As far as milling it, give Woodmizer, Inc a call. They have a network listing of all their mill owners, all over the world. Theses guys, who choose to be part of this listing, do so because of the occasional phone call it brings them to go out and do custom milling onsite. WoodMizer's in-line is 1-800-553-0182.
Also, check in at your local woodworking shop, local lumberyard, or exotic wood supplier. The Woodmizer bandmill owners tend to network into those places. Check around. Woodmizers are fairly abundant.