[jmcenanly]

The color looks like the type of resin used in model kits.Here is a photo of a 1/144 RQ-170 Sentinel from HobbyLink Japan

The model can be purchased on line for about $30.78. It would be a simple matter to scale it up from there.

[Jack Hydrazine]

Maybe they downloaded the paper version you can build and upscaled it!
http://myhobbycraft.blogspot.com/search/label/aircraft?updated-max=2011-11-18T17:58:00-08:00&max-results=20