The Gathright house probably originated as a Hooper home, since James Hooper [died in the 1750s] was buried in the adjacent cemetery. There are a very brief history and exterior photos at the Historical Marker Database at:
http://www.hmdb.org/Marker.asp?Marker=16209This old building was surveyed by the Historic American Buildings Survey eighty years ago. The documents are stored at the Library of Congress. Although there were no interior photos available online, there is much detail of the interior layout of the home at
http://www.loc.gov/pictures/collection/hh/item/va0501/Be sure to check all the .pdf files and not just the .jpg photos.
The LoC has more sheets in the original survey documents, which I have seen. I don't remember whether there were interior photos or not.
Edmund Hooper's grandson Thomas W. Hooper wrote about this house in the Richmond Dispatch article "About Beaverdam" available at the Library of Congress site:
http://chroniclingamerica.loc.gov/lccn/sn85038614/1895-02-03...See the paragraph, later in the article, which begins, "Near Cold Harbor..."