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I"m not sure I understand what "horizontal bulwark detail" means. Are you talking about the interior under-gunwale ceiling boards, as Whaler referred to them? If so, you can see the bow rail stantions in this photo. Installing ceiling boards in a "smoothside 21" could be a seriously difficult job, but I suppose it could be done.

http://smg.photobucket.com/user/lgolt...2462938201

They are made from mahogany, 3/8" x 2-3/4" section.