I finally got hold of some omniballs for my feet from outwaterplastics The large centre foot one needed a bit of doctoring so that it connected properly to the A&A parts but now my R2 moves around a lot more freely and securely
I took my R2 down to CE this weekend and joined up with fellow builders (Jeff, Oliver, Arnd, Mark, Steve and Wim) in the Droid Builders Room I got to meet Kenny Baker, Don Bies, Daniel Deutsch and Albin Johnson