I've only ever used a spray gun.

The main reason is that Dad has all the professional equipment and 30 years of spray painting experience !

I use methods similar to the factory, with overspray and underspray. Using a roller will look awesome, but it will not be authentic.

In the factory - they used a brass stencil and placed it against the cabinet (without touching it), and then simply sprayed the desired color - hence the imperfections. Gottlieb had the webbing and "Specs" to distract the imperfections.