Rust had taken out the top of the LH engine bay frame rail, so I cut the top out, treated any surface rust inside the rail, then fabricated a patch and welded it into place:
Notice the skirt under the battery tray? More on that next...
Next job was to repair the section of skirt under the battery tray.
This was not a fun panel to make - reverse curves are difficult!
Where the skirt joins the firewall is also rusted out, so this needs replacing next...