Ed,
if you are thinking of writing up your experiences perhaps you could start with an anecdote or summary of some incident to post in the “My Berlin Stories” forum in this website. As with any big project it’ll be easier if you just do it in small pieces.
I have a Berlin history website (search for “Berlin 1969” in Google or Bing) and it has about the same size as a book. I’ve added to it for over two decades. If I had just sat down to write it all at once I would have quit.
-- rwr