I saw ISE at CiscoLive last year. It looks pretty sweet. I am actually trying to get some policy buy in from the decision makers. I would really like to have a BYOD policy and then use that policy to help me with my design.
In addition to the lab availability, it may be helpful to take the VoWLAN guide and try to match its chapters to the testing objectives in the IUWVN test. That is one of the things that make using the design guides difficult. We may have to take a portion of various chapters and combine them to match the format of the testing objectives. A lot of info is there in the design guide, but it is just organized differently. I've started reading the design guide and have already run into this, so I am really wanting the quick ref guide.