"Why not make it a five engine aircraft?"
I agree, this aircraft looks really under powered. The design looks like a 747(with the possion of the deck flight deck) and 777(with the three wheel boggy and tail cone) and of corse a MD
-11. This looks really worst compared to the A380 becuase this just looks a md-11 with windows at the very top of the fulsalage. Besides that all ,this is a great desgin but I would really perfer the BWB(or the A380) than a double deck MD
-11 becuase when your building something you should allways try to use a different design even if this a consept, you know.