I agree with the others, nice work. I also had the same issue.
Started trying to custom bend the front bend when I realized that it was really the back of the pan that was off. I think when they are flattened to put in the shipping box, the angle might get a little skewed in the front. Then I discovered that my body mount hit the dimple almost identical to yours. Layed on the floor staring up at the bottom for a while. Decided that it needed to be moved back to clear the stampings and make the floor flatter. Straightened the back flange out and re-bent it at a slightly different angle. The rest of the floor lined up a lot better after that, so I started screwing it all down. Now all I have to do is flatten all the sides, weld in all the previous screw holes, drill all the cross brace plugs, etc, etc, etc,. I'll be watching to see how all this goes, good luck.