[clay68c10]

On the outer edges of the floor there's a cut out notch and the ribs in the metal are flattened out. I wasn't sure what to do with this area, so I figured that more hammer was the answer.
I used my RR track pieces as a backer to hold the shape of the long rib halfway and just started experimenting. I have a square face body hammer, it worked the best to form the corner and lay down the narrow rib.
This is obviously different from the factory stamping, but it works for me.
And it's not rotted away...