Here are a couple sites on the Women Airforce Service Pilots: WASP, Women Airforce Service Pilots of WWII Home Page Women Airforce Service Pilots (WASP) - TWU TWU Libraries - Texas Woman's University Women Airforce Service Pilots - Remembered By Those Who Knew Them. The British Air Transport Auxilatry also had women pilots.
I believe that is correct for the construction of the spars, internal frame members, and structural strength parts. The plywood skin itself was a balsa wood center with a poplar veneer and attached with both glues and brass screws. Or at least that is how I'm interpreting the stuff I am finding. I'll keep looking, remember even the Hughes giant HK-1 was mis-named the "spruce goose" since spruce wasn't the dominant wood used. But the title had a "nice" derogatory sound to its rhyme. My mistake, it was birch not poplar used in the plywood veneer. Here is the link to my post on this subject. I think the post # is 27 or 28. Goto: http://www.ww2f.com/what-if-other/4...-others-listed-below-1943-a-2.html#post530868
I'd imagine they went through a few different combinations of woods over the design life of the aircraft? Depending on what was available, and trying to get best combination, especially during the early part of its service. http://www.youtube.com/watch?v=-cb6SmK_c2g http://www.calgarymosquitosociety.com/dh98history.htm
I'd love to see the B-25, G4M, Ju-88, Do-17, and He-111 added as well. Just for grins. Very interesting graph. I can't quite make out the data reference. Where did you find it, Fred?
While there is no graph here, this article has a good consideration of 5 bombers that are called "most important" by the author. At least, I found it interesting. http://www.threedonia.com/archives/28547 While you're reading, this site has information on many different bombers. http://www.chuckhawks.com/great_bombers.htm
A Concise History of 77 Squadron RAF - http://homepage.ntlworld.com/r_m_g.varley/concise%20history%20of%2077%20sqd.html Good read!