Interesting site I found with 3D paper models of a Luger and some other handguns.
It is in Japanese but the link should translate - rough but good enough.
Basically you download the files, print on heavy paper, cut and glue. Might be a fun father/son project. The download includes some PDO files, which is proprietary, but there is a link to free software to read the files on the "In Beginning" page.
http://translate.google.com/translat...&hl=en&ie=UTF8
-- Dan