Yamato just set up the “Yamato Showroom” in their headquarter in Akihabara. It was opened on August 29th-30th 2009 but only limited to Yamato fan club members. There is no word for opening to public yet. So the only way to see this exhibition is to become a Yamat fan club memeber. If you’re interested to become a member, you check it out here.
Official Yamato homepage