@Kratos: MOGA SDK for Windows Phone isn't yet ready, patience, we're hoping to see it coming soon.
I write stuff on on the Intereoperability@Microsoft blog (http://blogs.msdn.com/b/interoperability)
@Peter: sorry about the late reply.
more than 7 pivots would be a lot for the user to navigate accross and could also cause performance challenges, if they have a lot of data. that being said it could work. I would encourage you to submit your design idea or app for a lightening design reviews, there's one every week: http://aka.ms/lightdesign