Interesting thoughts on the subject.
Im thinking, that during the shrinking season the boards could split apart.
During the expansion season, since everything is radial, the top would compress itself. This would force it to squeeze and expand in the longitudinal direction, so, like others here, I dunno. Someone mentioned that the individual pieces weren't that big so expansion would be minimal. I disagree with that because when they are glued up, it will act like one big board. However, it might be able to survive it all with no problem at all.
Me personally, I would not invest that kind of time to build it and just wait to see what happens.
Do we have any structural engineers here????????????????
Tony B Retired woodworker, among other things.
"Strive for excellence and settle for completion" Tony B