[400TT]

Les is right on the money. Painting is definitely not something you want to rush.

It's also not a bad idea to make a frame up that will support the body in exactly the same way as the chassis does. This will help stop and drooping/movement while the body is not attached to the chassis.

I've certainly heard of more than a few small disasters with bodies being away from chassis while being painted and not being able to be fitted back onto the chassis without causing stress cracks etc due to filler & paint being applied while the body was out of shape. Sometimes these stress cracks do not appear immediately.