I forgot to mention in my previous post, that you could design your own models. The premium choice among paper modellers is the Pepakura application that allows you to import a project in 3D from your favorite 3D design software, and creates an exploded view of the file, allowing the user to easily create printable parts for assembly. The Pepakura viewer is used to view .PDO files, the format used by the program, that others have created. To make your own, you need to purchase the Pepakura designer. Many, many .PDO files are available on the Web. Just search for .PDO and enjoy!