Very nice. How about a version to do this kind of part. This is an 13.5" diameter flange that is being cut to fit against a 120" diameter tank. I also cut one to go inside.
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Gary, one other word about that.
His script already does that kind of part -- in a sense. It creates half of the surface on which to map your other features. You can mirror the surface he creates, and it becomes a barrel-shaped surface like you want.
Lloyd