Send your existing doors to my man "Kulasa the Dipper" in Detroit and he'll make em' featherweight and you can still boast that you have an all steel body.
He can take weight off in designated areas so that areas that are meant to keep the strength ( Hinge mount panel, door striker panel) can stay that way.
You would have to paint them again though. Keep the Bows and Fodes scratching their heads. LOL.
Wish you were in my part of town and at sometime (because I'm busy) we could get that pup down to 2700 Lbs.
.. interesting concept on the door lightning program.. I think I will have to explore that idea further..
