Mine was not as bad as yours is, but I didn't like the pitting, especially down in the nook between the 2 pieces. On the left is the driver side lower from my parts car, and below, the passenger side lower that I made in progress.
I used the inner bottom from the driver side, too, just had to make the inverse of the part that mounts below the long
This was all months ago. I still need to smooth it out. I can make this look almost seemless with a bit more of the roloc disc.
I need to blast off the final bit of pitting there and fabricate the flange on the lower right there.
I have to take the filter mount off the other and put it on this one, too.