I came up with an idea for a simple door bending jig, overnight (I am a carpenter by trade) It should take me an hour to make, and will give a lot more leverage on the door, without having to slam/push the frame against a 2"x4" block or whatever.
I'll let you know if it works, or not
The 'welding panels' link (third link) on this page takes you to pics of out most recent progress, you can see the drivers side fender is back off again, as we're working on the door.