Actually AIMS2013 has already a built-in Mobile Viewer, targeting iPad/iPhone and iPod Touch. Please refer to http://usa.autodesk.com/adsk/servlet/pc/index?id=1
Mobile viewer—Use this browser application with most mobile platforms, including Google Android™-based smart phones and Apple® iPhone® and iPad® mobile digital devices.
If you want to customize mobile viewer, hope this blog are helpful for you. http://adndevblog.typepad.com/infrastructure/2012/
Somehow the user would like to use the desktop version of mobile device eg. ipad. Is the fusion viewer be possible supporting multi-touch?