1.That car lot can be into a plugin (unless, you're talking about having cars move around in it, then it would be nearly impossible.
2. Just use the UFO as a template
This building is located in my town and is used for sports such as hockey, volleyball, handball, boxing, and is also used to organize musical impezines
I like the idea!
It could add to the immersion. But if they make it in the decorations tab that you can place decorative items like zones. It would be cool in my opinion