Reddit reviews Race and Rally Car Sourcebook: The Guide to Building or Modifying a Competition Car

I think you'll be hard pressed to find actual detailed schematics.

http://www.amazon.com/Race-Rally-Car-Sourcebook-Competition/dp/085429984X

That book has a lot of pictures and diagrams of various racecars (both production based and formula style) and discussion about design considerations.

The To Win series by Carol Smith has some wisdom from a man who built a lot of formula cars, but it's mostly technical stuff - not straight up schematics.

The only resource I know of that has full schematics about how to build a car, is Build Your Own Sports Car for as Little as £250 and Race It!, but that's to build a 1960 era Lotus 7. (If you want to check this out, I have a .PDF copy I might be able to upload, as the original is out of print - the book shouldn't cost 1/2 the price of the car they teach you to build IMO, lol).

A while back, I had the same dream - except not a Formula 1 car, just a homebrew of some sort.

To get "practice" at putting a car together, I taught myself a 3D CAD program called SolidEdge (similar to Solid Works, except there is a free academic version that's readily available to almost anyone). I looked everywhere for schematics of real race cars so I could attempt to model one before I started working on my own design. The best thing I could find was that Build Your Own Sports Car book.

Seems like nobody wants to give away their design secrets - even with 50 year old cars...

About 10 years ago a friend of mine got a book about Ferrari's ~2000 F1 car. I think the book cost $250. You could probably build a ~2000 Ferrari F1 car based on the photos and diagrams in that book, but you'd need an extremely well equipped shop to do it, and it would still cost hundreds of thousands of dollars just to make the shell and suspension. I don't even remember what the book was called. I think it might be this one, but I'm not sure.