Painter Wants the Body On For Paint

[Papa]

I talked with my painter and he wants the body on the car for paint. I know there are opinions either way on this, but what I really want to know is how much of the interior should I complete before putting the body on for the "last" time and getting the car to the painter? It seems I should get the carpet in at a minimum. I plan to assemble the car (lights, wipers, windshield, etc.) and then take it all back apart, but are there any suggestions or advice from those that have had their cars painted with the body on?

Thanks,
Dave