Wow. Converting a Revell 1/96 Contitution into a convincing 1797 Constellation to a reasonable standard of accuracy would be a huge project; I'm not sure it would be significantly easier than working from scratch. Doing it with a Revell 1/192 kit might be a little easier, since nobody would expect the standard to be so high.
Howard I. Chapelle's History of the American Sailing Navy contains a redrawn version of the plans from which the original Constellation was built. They don't contain a great deal of detail regarding such things as deck furnishings - and there's no sail plan. I'm not sure whether any scholar has ever done much research on the details of that ship.
Two interesting books that deal with the ship are the extremely argumentative The Constellation Question, by Howard I. Chapelle and Leon Polland, and Fouled Anchors: The Constellation Question Answered, by Dana Wegner and another gentleman whose name I'm embarrassed to have forgotten for the moment. Both those works concentrate on the issue of the ship's history.
A few years ago the Naval Institute Press published another book, whose author's name I don't remember, which attempted (once again) to argue that the 1797 frigate and the ship now at Baltimore are in fact the same ship. That book got an extremely negative reception in naval history circles; I can't recommend it.
One option that you might look into (if you want to work on a really small scale) is the series of cast-metal kits offered by the British company Skytrex. They're on 1/700 scale, and are intended primarily for wargamers, but they're surprisingly well-detailed for their size. I don't think Skytrex makes a Constellation, but I think the Chesapeake is in the range. That might make a good starting point for a conversion.
Sorry to be so discouraging. The sad truth is that the old ship just hasn't attracted as much attention as she deserves.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.