For those of you who may be interested in scratch building of (most probably wooden) working vessels, I just came across http://www.freeshipplans.com/ . I just downloaded his plans for Strongbow, a steam paddle tugboat in 1/75 scale. This one is 64 sheets of 200ppi JPEGs. There are many others. Most of the notations are in foreign language, usually German, but what the hey, the price is right and you can likely get by with an online translator. The detail of the plans is complete and excellent.