I've thought of that as well, but I found that it is far easier, and actually cheaper, to buy a complete car. If I were to buy an engine and gearbox separate, I'd have to do a lot of fabrication to install it, then I have to search for parts, buy lots of new parts and stuff. It's a lot easier to buy a complete car with everything I need, where I can sell the rest of the car (in parts) to regain some of my money. It should be fairly easy to sell parts worth 1000-1200 off the car after I've taken what I need.

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If you have a 5 cylinder, you don't need a stereo.

1999 Audi A6 quattro
1990 Volkswagen Golf CL Syncro
1987 Audi Coupe quattro