I've honestly only ever had one remotely negative thought regarding Mr. Page's consistently brilliant solos: Always thought the studio version of Immigrant Song could have used the solo from the BBC Sessions version. It is absolutely perfect.
Amazing post. Thanks for undertaking and sharing this excellent Zeppelin research. It's sort of a strange feeling to realize that these places actually exist...they really always seemed like something not real, a true "fantasy sequence," after having only seen them in the movie so many times.