For a different and equally considered take on ECM: A Cultural Archaeology, I strongly encourage you to read John Kelman’s characteristically articulate and insightful meditation on the very same in a recent piece for All About Jazz (it also contains some clearer photographs of whole rooms). While you’re there, be sure to read his eye-opening interview with Eberhard Weber.
Between Sound and Space: ECM Records and Beyond 
Thanks, Tyran, for the kind words and the very kind plugs. This seems to be the beginning of a beautiful friendship 🙂
Seriously, though, you’re doing some fine work here; keep it up!
Best wishes!
John
Of course, John! In a day and age when people write a four-sentence paragraph and call it a review, it’s comforting to know there are those like you who aren’t afraid to go right to the source and flesh out the details along the way.