Here is a direct link to NASA's 3D model page.http://www.nasa.gov/multimedia/3d_resources/models.html
Now this is pretty amazing.
Thats beautiful design work. If you did it yourself in a CAD pkg or Art SW its yours as "ART" If you wish to protect your work you can sign it so to speak. Put your name or handle or something inside say the heat shield or something.If you want to make a few dollars off each design look into this firm and see you can buy and sell this way. http://www.ponoko.com/make-and-sell/sell-eps
New Mars Curiosity Roverhttp://www.thingiverse.com/thing:27908This one looks like it will have a great deal more features and detail.