I was searching for Havoc entries and came across your forum entry. As it happens, my father worked in the aircraft industry during the war.
I have a photo and a writeup on the Turbinlite. I would be happy to post but do not see the site upload mechanism.
Paul B
I read further and am trying this from PBucket
Photobucket updated and link revised July 26, 2010
Douglas A-20 Havoc pictures by brookcreek - Photobucket