I don't remember the kit clearly; I haven't seen it in at least 30 years. My recollection is that the basic hull shape and proportions were reasonable, though the detailing wasn't great - and the kit, like the others in that series, featured those abominable injection-molded plastic "sails" cast integrally with the yards.
What Aurora used for a source I have no idea. There used to be a sort of standardized impression of what the Bonhomme Richard looked like; pictures and models that looked about like that kit turned up in quite a few books and at least one other plastic kit (the one from Pyro). I suspect the Aurora people started with a model in some museum, and worked from there.
Dr. Thomas Graham's book on the history of Aurora may have something to offer on this subject. That book is high on my wish list; his volumes on Revell and Monogram are among my favorites.
If you're interested in what modern scholarship thinks the Bonhomme Richard looks like, you owe it to yourself to check out the reconstructed plans by Jean Boudriot. And another reconstructed version is being described in a series of articles currently running in the Nautical Research Journal.
Some people think that speculative reconstructions of famous ships aren't legitimate model subjects. (Howard I. Chapelle once wrote a famous article called "The Ship Model That Should Not Be Built." He put the Bonhomme Richard close to the top of his list.) I don't agree. In my opinion the reconstruction of an historically important ship, in either model or full-size form, can be a fascinating, useful, and rewarding exercise. (I also think it's incumbent upon the researcher or modeler to be absolutely up front about what the finished product is - that is, to identify it as "A Reconstruction" wherever possible.) And if two researchers, using careful methods and consulting all the available historical sources, come up with different conclusions as to what a particular ship looked like - well, so much the better.
Wish I could help more. Good luck.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.