I installed engine/trans on k member , then lowered the body on it. Installed suspension and brake lines , then sheetmetal . Put tape on edges to protect. Then it was wiring ,fuel system ,interior etc. Last was glass. If someone wants to paint their car in pieces , I think the key things are : paint all the outer panels the same day, orient the panels in the way that they will be attached to the car and make sure you have plenty of coverage.