These are some of the concept sketches I've made for the environment. The greyscale version was the initial concept. However it felt to confined so I decided to get rid of the roof in order to make it feel more grand. It's meant to look like it's situated below the foundation of huge sci-fi building. That's hard to see in this setup so I'll to make and exterior shot sometime.
The wings of the plane are in the 'fold'position in the concept, but I've changed that in the 3D version, because the wings where a nice surface to walk upon.