Thanks for the follow-up Graham. Sounds like a book I shall have to acquire!
Here's another picture of a FAGr 120 Ju88D, this one without gondola but with the old style nose window.
Specific questions to Artiebob regarding A6+EH which crashed in Iceland in 1942 would be if the modifications included the rounded glass nose and just the single gun cupola. I suspect this early in the war the faceted windows and the twin gun greenhouse would be most likely.