Colosseum,
I live in Oregon and I have obtained microfilm blueprints for several ships from NARA without ever leaving my computer. Now I think you can get scanned images from the microfilm on DVD. Here is what you need to do:
1. Obtain the "Reel Number" for the blueprints for your ship from the Archivists at NARA. This will be in "Record Group 19" where ship plans are cataloged. The Reel Number is actually a catalog number for the drawings for a particular ship.
2. Find out how many physical reels of microfilm are in the "Reel." This is confusing, but a given catalog Reel Number may include many physical reels of film. For example, the Cleveland class light cruiser Reel Number 5537 had 19 individual reels of microfilm.
3. Also find out if there is an Index Reel. Some pre-war plans did not have a single index reel that listed all of the drawings, but had an index on each individual reel. To find out what drawings were on which reel you had to buy all of the reels ($$$). Later plans have an Index Reel that lists all plans for a ship.
4. Drawings are included on the reels in the order listed in the Navy Filing Manual listed on page 43 of this document:
http://www.hnsa.org/doc/pdf/navyfile1950.pdfHull drawings (S1, S11) are on the first microfilm reel. Figuring which reel contains other drawings can be tricky. Small boats (S82) are usually on the last reel. You can make a guess which reel holds what by dividing the total number of reels by dividing 97 (the highest S number) by the number of reels. This tells the approximate number of drawing categories on each reel. Then if you want to know which reel the propellers (S44) are on, divide 44 by the number of categories on a reel. This doesn't always work because some categories have only a few drawings (propellers, for example) and others (engineering) may have many hundreds of drawings. But it will tell you approximately which reel will hold the propeller drawings.
5. Order the reels you want. NARA doesn't sell copies - they have a 501(c)(3) friends group who actually do the work. You send an order for Record Group 19, catalog Reel Number whatever, and the physical reel numbers. Last I looked it cost $65 per reel. The Archivist will tell you how to order. They used to mail an order form that you then sent in to place the order - along with a check.
OK, so you aren't sure that the drawings you want are on a particular reel. But how much will it cost you to hire someone at College Park to look through the reels to see where the drawings are? In the long run it is probably cheaper to order a reel, look at it and see if the drawings you want are on it. If not you will at least have a good idea which reel (lower or higher number) will have the drawings. And at least you will have blueprints for some part of the ship that may come in handy someday.
****
This all takes time, but you can get the drawings without having to pay someone else to try to guess what you really want.
****
Here is a site where you can search for ship plans at NARA:
http://www.hnsa.org/doc/nara/searchplans/index.phpPhil