Of course it is OK to present an image of these landmarks in a virtual world. It is no more illegal/immoral than it is to take photographs of those same icons. A virtual world representation is nothing more than a 3D image of that icon. It should be under no more or less control than any other type of photograph.
Great idea, but what is the point of staging it on a Thursday afternoon when everyone will be at work? If you are looking for an Australian audience, at least host it at a time when Australians can log in.
