this is true Duncan, It is one solid piece of walnut glued to the bottom ring. I turned a recess in the walnut first then glued it to the glued up rings (being very careful to center it)
turning the outside was a breeze, however the inside is what threw it out of the chuck so many times very scary! It blew out the recess the final time so I screwed it to the faceplate. Then after finishing I sawed it off and sanded the bottom.
Anybody can become a woodworker, but only a Craftsmen can hide his mistakes!