I started by buying scroll saw plans online, but the fenders were flat, and some of the other features was close but not actuate to the real car. In case of the Auburn, there were no plans available anyway. Using calipers on the toy models and a lot of practice in Rhino, I was able to get the complex parts. Parts like the wheels and bumpers were done with Aspire. My brother has a warehouse with a collection of the real antique cars, which gives me the idea on which old clunker to build next.