There are a few companies listed on the "Makers" tab that offer cars in kit form. Some are more complete than others. You may also want to take a look at the article on the home page that documents in considerable detail what is involved in the building a car. If you are planning on building for the adventure and have good mechanical skills, you will probably have a great time doing it and be very proud of what you have accomplished. On the other hand, if you are thinking you will save a bundle by building yourself, think again.
Cheers,
Hoss