Here's a small but reliable plan that may have enough information on it for your purposes: www.ussconstitution.navy.mil/images/Best%20Ship%20photos%20Gallery/43-1168a.gif
If you need more detail than that, it's available all right - but may be hard to get in Britain and may cost quite a bit of money. Quite a few people have drawn plans of the
Constitution over the years. A couple of books that have relatively small reproductions of rigging plans in them are Alexander Magoun's
The Frigate Constitution and Other Historic Ships and Thomas Gilmer's
Old Ironsides. If you need plans on a relatively large scale, the best place to start is the Smithsonian Institution. It sells copies of most of the plans in its collection, including the set by George Campbell that was the basis of the big Revell kit. The Smithsonian's prices are pretty reasonable, but they charge by the sheet - and I suspect that set of plans has lots of sheets in it. If I remember correctly, the first step in getting a set of ship plans from the Smithsonian is to order a catalog; that can be done on line. (I don't have the exact web address, but a search on the word "Smithsonian" should, with a little determination, get you there.)
Taubman Plans Service (www.taubmansonline.com) sells the set of plans published by Bluejacket for use with its wood kit. Those you can buy on line, but the price is (brace yourself) $90.00.
My other suggestion is to try the local library. Quite a few books about ships contain plans of this ship. Depending on the amount of detail you require, you may find what you need locally.
I'll exercise my senile brain cells about this one. Surely there's a simpler way to get hold of the plans of that ship without spending an arm and a leg. If I think of it I'll be back. In the mean time, maybe another forum member can help.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.