Uggh I feel your pain. I've had a few pieces that I had to scrap because of warping. On one project I made the tolerances so tight that I had to make the same piece 4 times before getting it.
If you don't mind me volunteering the suggestions, I'd like to help you figure out what went awry on the skid before you weld on the new one. Especially if you have to do the same welds. I've had to put projects on the shelf for weeks from getting so irritated. Are you going to have to weld steel on the plate in a T joint again?