Regarding the oversized windows: Just take a look at some of the buildings. Office buildings and some other luxury buildings sometimes have multi stories windows.. and, since in essence, it would be transporting VIPs as well as regular passengers, it wouldn't be much of an issue. Besides, I head that the regular airliners are gonna get something like this: switchable containers, that just get mounted on an airframe (is that a correct word?), which may contain passengers or cargo. Increases the efficiency of loading.
