Yeah , looks like another one of those "lost to history" stories, no one back in the day had any idea the future generations would have interests in this type of thing, sad , but that's life.
I guess if you could find anyone from the unit that flew with them or crewed the Lbirds "Maybe" they would be able to help , anyway good luck on it !!!!!!!!!!!!!!!!!!
Johnny
Have you tried to see if they have a current "Reunion" gathering, they may have a historian that could help on the design etc .