I've been leaning towards the idea of painting it with the whole car together, doing the engine bay/under hood, trunk, door jams first, then comming back later and doing the body. I think I would have a lot tougher time putting everything together without damaging something, not to mention chipping up the paint on all the bolts for the hood, doors, trunk, etc. But I'm sure the pros have their ways around that too. The door jams and trunk I'm not as concerned about, but would you mask off the engine bay after it's painted to prevent getting overspray when going back to paint the body?