The Gundam went walkabouts (for real?) to Shizuoka City for a year, then ended up in its present location in Odaiba. I don't believe that the cockpit is accessible, but I'd be pleased to be corrected on that one. At its feet is another Gundam Cafe (the original is located in Akihabara), and a Gundam gift shop. There is also apparently the Gundam Front Tokyo attraction on the 6th floor of the Daiba City Mall, which I missed.
Now, it seems that the life-size Gundam was scheduled to finish at the end of March 2013. Any confirmation on this? I'm glad I went now! Where will it end up next? In orbit? Do that!
(Personally, I'm more of a Neon Genesis Evangelion fan, and am waiting on a life-size version of one of those beasties to pop up.)