[Jeffs70]

Here are some pictures of what I did on the corners. that may help you.
most of it is using a grinder and cut off die grinder to get the shape i had in my head. and adding pieces of sheet metal back where it needed to be.







Here is the lip that hangs over I had to clean up under it and around it to weld up. I noticed a bit of surface rust I had to get rid of also.