At this time, it depends on which direction you plan to develop.
If you only do beauty, you mainly do car decoration, such as external film pasting, polishing and waxing, indoor leather cushion, and refitting navigation radar driving recorder, you usually need at least two facades.
If you add sheet metal painting, it is equivalent to a car repair project. If you use sheet metal, it will be difficult to have a big accident. It needs a lot of equipment and space. If it is expanded, it will be called "factory" instead of "shop".
Therefore, the main aspect of sheet metal painting is painting. Some cars are scratched, so simply putting a sheet on them and painting them can complement each other's beauty and count as many customers. It's up to you to choose whether to specialize in beauty or add more services.