Followed by fixing the front, lower corners of the box where the original design allowed water to infiltrate and eventually rot the interior corners I just repaired.
I scribed the curve of the lower box valence on to pressure treated lumber sure to outlast the original plywood pieces.
Sheet metal lapped to push any moisture away from the wood with enough caulking to seal a ship. Then metal roofing screws with rubber washers to hold it all together.
Should keep it all free of rot. I'll clean up the excess caulking once it sets. Still too cold around here.