If the rings are good and the bark doesn't twist, go for it. Why let such an incredible tree go to waste. Think of all the belly splits. I tackled a 24" tree and it was some of the best wood I have ever seen. It looks like your log has some natural splits in the center. Mine had the same. Start your splits there and it will be easier to bust open. It looks like it is naturaly split into 4 sections. You are going to need a lot of wedges. A prybar will help to get it apart. Seal the ends with several coats of what ever you use. When you get belly splits, seal the backs of those also. Man, thats a heck of an osage tree. I would be all over that thing if it was by my house.