[Chock]

Some sources, especially the bottom link (scroll down and you'll find a plan book for the Balao that's probably good enough to build a real one):

http://sonic.net/~books/submarinememorabilia.html

http://www.usscrevalle.us/

http://www.maritime.org/fleetsub/index.htm

http://www.floatingdrydock.com/

Chock