I really like that, did you use green or dry wood?
I cut down some dead standing ash about 6 months ago, split some 18" long bits in half and left them to dry!
As long as you have taken the pith out it should not split, saying that, i'm on my third attemp at a Kuksa cos they keep splitting on me!
RM
Nice job you did on that RM, bring it along on bimble day so as I can handle it.