My custom 1/48 Enigma is at the bottom of this page:
http://www.macrossworld.com/macross/toys/m...stoms-148-3.htm
MW Member Kurt also did some absolutely incredible Enigma schemes, among many others.
Far as I know, the Engima scheme originates from a Japanese Hobby magazine, entirely made up by the artist/builder and not based on a real life scheme, but I could be wrong here.