Have you checked in recent volumes of Cross and Cockade
International ? This publication has put out several articles inthe last
couple of years from the DH-2 Research Group, including an excellent set
of drawings included with one issue. I don't recall the specific
aircraft you mention ( issues aren't here in my office but at home). All
of these were published in last 4 years and are available as back numbers.
Charles Hart
hartc@spot.colorado.edu