To wit:
(https://farm5.staticflickr.com/4518/37745864524_836fc90681_z.jpg)
Anyway, bought a piece of aluminum diamondplate and 3M outdoor double-sided tape and after trimming, Viola!
(https://farm5.staticflickr.com/4537/37745867744_c5070e5f65_z.jpg)
Still a few small scratches above it, but I think we can live with those.
That's a piece of door edge trim covering the top corners, which were sharp enough to be a hazard.
I am considering aluminum pop rivets at the corners to back up the tape.
Good work it looks better now!