Found this tutorial on making a Lamborghini Miura in Rhino posted on a BB the other day. 3 full pages of pretty detailed steps with pics and all. The first post also has a link to the SMCars board which has tons of blueprints for cars, great for using in Rhino for modeling (just watch out for the annoying popups and utility that it asks to install on your system which you don't want).
I'm working on this car now and plan on machining it with Mastercam when I'm finished. I'll post some screen shots when I'm done