Unfortunately, zenphoto is done entirely by volunteers and no one has volunteered to update the instructions. There is a guide to the zenphoto functions that you might use in making a theme. See the link off http://www.zenphoto.org/category/User-Guide/.
Most people just pick one of the distributed themes as a starting point and start changing it. Example or Default are good starts.
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Most people just pick one of the distributed themes as a starting point and start changing it. Example or Default are good starts.