I'm designing some Colonial style cannon ball bedposts which will be turned out of cherry. Is there any guideline on how small a diameter should be left between turned elements above the bed rail level? I'm using 1 inch below the rail as a minimum, but above the rail with an urn, bell, and cannon ball 1" seems kind of "clunky. Obviously I don't want the bedpost to break if kids decide to swing on it at some point in the future, but I just wondered who might know some reasonable guides. Maximum square post dimension is currently planned for 3 1/4 inches. Thanks!