In case if anyone is interested, I have currently found some links to some interesting material on some Japanese sites which deals with exhibits and other stuff that relates to the final two films of the Kiryu Saga, "Godzilla Against Mechagodzilla" and "Godzilla, Mothra, Mechagodzilla: Tokyo SOS". The first is of the exhibit which opened durring GXMG. While I do not remember the exhibit's name, one of the features of the exhibit I do remember is that there is a part which you could see how much of "GXMG"'s science is real.
The second and third links pertain to the second film, "Godzilla: Tokyo SOS". The first is something simular to what people have seen with Toho's in-store advertisement Akihabara.
The third linksis of a press/public event held back on Nov. 26, 2003. Toho usualy holds these kinds of events for publicity.
Better save those rare images onto your hard drive!