Yaughn's correct to a point. Straightening a warped panel can be done with heat and a little time. I've "straightened" panels on a dune buggy and other kit parts by simply laying them in the yard on a hot sunny day, and using boards/weights/ratchet ties tweaked them where they needed to be over the course of a few days. But those were panels that were ultimately bonded or bolted in place - try that on a free-floating panel, like a hood, and it will eventually return to it's pre-tweaked state.
What exactly do you need to do? Fit the doors?