The car is completely bare metal and the joints are clear. It would only take time to do the welds.
It indeed could be a point to start rust. But the car will be thermal zinc sprayed. So it would need to go through that sacrificial layer first. The car will be overloaded with anti rust/preventive stuff when it's hanged in a hoop, so that stuff will get everywhere.

Just want to know if it is worth to do it. and if you can feel the diffrence. I know the chassis of these things are very weak.