That is a very interesting idea. I've done something similar although I have to remove and replace the section manually. Even that works wonders - I have three big vignette areas - three sections that fit in the same place; a lake, a grassy field with soccer players, etc., or a 'secret missile base. I move the way he has the area flip auomatically. Have got to see if I can arrange that . . . Very cool.
Thanks for posting this.