Thanks Crack, even though it is too great an honour. I only have reported some facts of Nicolaisen's research.
But yes, it is a very exciting and complex topic, especially when you are going to deal with regional or local aspects for instance, where the gun emplacements were situated, relocations of Flakhelfer, and so on.
And I personally gained a lot of Wim's Waisenhaus subject, so this thread honestly deserves its more than 40 posts ;-).