Thanks for all the kind words. I turned the insides, it is heavy, and I don't think it would float.
Thickness is about 1/16th of an inch at the top and about a 1/4 in towards the bottom. The actual bottom is about 3/8" due to the cutout for the chuck. Darnedest stuff to finish I've ever done. Because it's so hard it's easy to sand smooth, then polish, but it wants to turn green. I actually sprayed on a poly finish twice and sanded it back off because it wouldn't harden. Finally, I sprayed it again and set it aside for a couple weeks. The wood eventually returned back to the original color (which you see here), then I steel wooled it, then applied another coat of poly. I waited a week and did it again for a total of three coats. I've got enough from the corners I cut off to make a few pens. Will have to try that since it's so heavily figured.