Good luck pressurizing the cabin module without making it excessively heavy. The flat bottom is going to be tough and the sharp corners where the flat bottom me

Good luck pressurizing the cabin module without making it excessively heavy. The flat bottom is going to be tough and the sharp corners where the flat bottom meets the sides are going to be really tough. It would be a lot easier to do a "tube in a tube" concept using a swing up nose like what is already available on the 747 (could be available for the A380). https://en.wikipedia.org/wiki/File:Cargolux_B747-400F.jpg https://en.wikipedia.org/wiki/File:Cargolux_B747-400F.jpg Then use cameras and video screens to simulate windows. References: * Boeing 747 "Large Cargo Freighter" aka Dreamlifter https://en.wikipedia.org/wiki/Boeing_Dreamlifter https://en.wikipedia.org/wiki/Boeing_Dreamlifter / http://www.primeportal.net/hangar/howard_mason3/747_lcf/ http://www.primeportal.net/hangar/howard_mason3/747_lcf/ * Airbus Beluga https://en.wikipedia.org/wiki/Airbus_Beluga https://en.wikipedia.org/wiki/Airbus_Beluga