Building a car from scratch is a complicated and time-consuming process, but it is possible to do with the right skills and knowledge. First, you will need to obtain a car chassis, which can be sourced from a salvage yard or online. Next, you will need to gather all the necessary parts and components, including an engine, transmission, suspension, and brakes. Once you have all the parts, you will need to assemble them into the chassis and connect all the systems. Finally, you will need to test-drive the car to ensure that everything is working properly. While it is possible to build a car from scratch, it is not recommended for beginners due to the complexity involved.