I haven't found a series that does a better job illuminating the subject of manufacturing than National Geographic's Ultimate Factories.
When you restore or customize your ride, it's difficult to do it well if you don't understand where it came from or how it was put together. If your serious about your hobby and it involves being hip deep in your car's parts, then Ultimate Factories is a must-see.
Although this is a review of the series, it's also a guide that references every single episode I could find with a perspective geared specifically towards the automotive enthusiast.
Check it out and enjoy!
This five-disc DVD educational series on paint and body repair is a great and inexpensive way to introduce yourself to the complex and often misunderstood field of automotive body repair.