Jamnett - Sounds like you had a Federal Experience. I'm sure there's a good, fairly simple way to get hold of ship plans from the National Archives; modelers do it on a regular basis. Unfortunately I've never done it myself, and have no idea what the trick is. Maybe another Forum member can help with that one.
I
have ordered plans from the Smithsonian - though not in quite a few years. Here's the web address:
www.americanhistory.si.edu/csr/shipplan.htm
Unfortunately the ordering process is somewhat cumbersome. You have to start by ordering the relevant catalog (via snailmail), then look up the plans you want and order them (also via snailmail). The good news is that (a) the Smithsonian doesn't sell junk, and (b) it has a fine reputation for good service and reasonable prices.
Another excellent source of plans is Taubman Plans Service. Abe Taubman, for many years a fixture in the ship model world, has recently retired (at age 93) and turned over the running of his business to the folks at Loyalhanna Dockyard. They have updated and improved the firm's website, the address of which is
www.taubmansonline.com
The site is still under construction to some extent; not all the plans are illustrated. There's a set of plans for the
Kearsarge on the list - scale 1/8"=1' (same as the Revell kit), price $15.00. In the absence of a picture I don't know just what these plans are. But they might be worth a look. I suspect an e-mail or phone call to the Loyalhanna folks would get a courteous and knowledgeable response.
Hope this helps.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.