Good Day Andy,
Must say I think I like your work, simple and methodical!!! Version 0 is a very critical step that many Developers/Managers tend to ignore, they dive staight into the deep-end without the critical work of preparation. I'm glad you highlight it's importance.
It seems to me that you will be using the Kimball Methodology, as you mention "Data warehouses simply do not lend themselves to waterfall methodologies; they’re better suited for iterative development", to develop your DW System. Is this the case?!
Looking forward to your next Piece of Art!!!
A keen follower of your work on the Stairway to Integration Services!!!