Ron,
Thats a pretty impressive walnut butt! On a slightly more manageable scale, I have sawn quite a few big black cherry buts and a whole bunch of butternut. I have a friend who has three big black walnuts and he asked me how to turn them into planks. There is a local chemist PHD who's hobby is collection and running saws. The last time I spent the day with him, we cut up 2000 feet of 1x12 white pine. I think he charged me $200. The point is- not all trees are firewood. Lots of ash is going to the dump or into the stove because of the emerald bore. (ash is great furniture wood) A butt 24 inches can squeeze into a size normal rifle stock. An internet search could easily turn up a local guy with a band saw on a trailer who will come to saw things up. It is great fun to pull planks off the saw and stack them up. The art of making planks is half saw and three halves stacking and drying. If not stacked and dried well , you get flatish lengths of fire wood.