Ok
1. I doubt you could make anything like this.
2. Its a Skyscraper, Go to New York and they are almost all cubes.
3. Its not suposed to be filled.
He asked for a rating, and he gave it so shut up, doesn't matter if he could build better then this.
Yah, most of the buildings in new york are square, but guess what else, no one goes on to loving lego games and builds them
edit: Oops, didn't read cucumberdudes post, but he said it much better then I did :P