First you need to learn how to build a car...sign in for an automotive education.
Will take you a while before you will master the art of building a car.
Than master your CAD program.
Than make all the several parts and assemblies.
Only a few steps that you have to take before you can build a great car..
Hope to see very nice models from your hand....
Assembling of auto parts is itself a very broad study and requires so much of skill and expertise. There are several sites like autoanything, assemblymag and many others where you can see assembling guides and specifications of major parts. In addition to this, I would like to suggest that reading a guide is not merely enough for learning the assembling because it will be crucial to perform without practical knowledge. Therefore please consult with any <a href="http://www.iautobodyparts.com/shop_by_part_category.html">
auto parts dealer</a> or car manufacturing shop because by watching the live assembling you will be able to learn more effectively.