Hi Robert,
I've been researching the final raid on the DEK carried out on 3 March 1945 for nearly 3 years so your post is especially interesting to me. This site:
http://www.bomberhistory.co.uk/Canal...EKHistory.html
is a good starting point, it gives some detail about flak positions though I'd be interested to know if there were more.
My personal interest is one of the Lancasters lost that night, ME453 of 467 squadron which was allegedly shot down by flak, though my investigations point more towards Heinz Schnaufer shooting the plane down. I have written to Ladbergen to ask if anyone has any further information about flak positions, and posted similar questions to yours on other forums, but without success. I have quite a lot of data about this raid from a Bomber Command point of view which I'm more than happy to share with you if you'd care to e-mail me off board. Take a quick look at my website
www.galgos.co.uk for a summary of my work.
Regards
Max Williams