Did one ages ago, dont know if I can find the pictures. Effectively a log sliced into I think it was 5 pieces, 4 turned into end grain bowls with a thick wall 5th was reversed and I think just tarted up, but may have been an upside down end grain bowl. Then a single hole was drilled and a dowel put through the stack, so they could swivel open .
Then I put them together with glue and paper in the joint, and turned the outside. Was quite good but not made another since.