Can not help you with that, aa, but there is a thread in a German Forum with lots of pics of Do 27 and Do 28. But it´s in German only, and you have to log in to be able to see the pictures.

http://www.flugzeugforum.de/forum/showthread.php?24636-Dornier-Flugzeuge-flugfähig

Michael

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Will give it a try – thanks for that!