I understand your fear, but if the bodyshop is reputable, you should be fine. As long as they don't leave it outside with the windows down, with the interior still in it, in winter... you're good... I speak from experience...
Have a friendly chat with them and express your concerns, (key word friendly) and you'll be good.
I think you're giving yourself ulcers over nothing.
Post pics when you get the paint on!