This fantastic work by [Native18] shows a quad copter reproduction of the Heli carrier used by the Avengers. Following this thread (translated), you can follow along his thought process as well as his build process as he proceeds. The construction is mainly paper and lightweight foam, but it still manages to float and even take off from the water.

We’ve seen other aircraft carrier designs before, but not many this well polished, and none that took off from water.

[via technabob]