I used the same thickness of steel for the majority of the repairs, but for the corner piece at the drivers side I used slightly thicker steel because I cut and welded it to create the curved shape which meant grinding it a bit more to get the welds flat. This would potentially weaken thinner steel and would have been more difficult to weld if it were thinner. Other than that piece, it was all the same thickness.I think any existing ones out there have either already been repaired or are just as bad. One question though, the steel is very thin so did you use the same thickness to make repair sections or something a bit thicker?