I ended up making four three legged stools. The first two seats split, the second two I finished and gave to the boy child and SIL while we were in Houston. One of the first two with a split seat I threw away, good firewood, the second just had one split that could be saved with a butterfly key. I made the key and knocked it home tonight, Tomorrow I'll plane it flush and the stool should make a nice shop stool. It is perfect height for working at the bench.
I couldn't have planned it better.