As of June 2015, plans for wood duck boxes are available on websites for Ducks Unlimited, the Wood Duck Society and the South Carolina Department of Natural Resources. The PDF plans include written directions and accompanying illustrations.
Ducks Unlimited has wood duck box plans in the Waterfowl Biology section under the website's Conservation tab. The instructions also explain how to construct a predator guard for the box out of plastic or metal pipe or sheet metal. The Wood Duck Society offers a download of directions for a cedar box. Users can access the plans from the site's home page under Wood Duck Box Design.
Wood duck information is available through the homepage of the South Carolina Department of Natural Resources under the Wildlife tab. These plans recommend using cedar, yellow pine or cypress boards for a duck box.