[Ron Ramirez]

The material is much like the "matting" used by custom framers, and you can buy it by the sheet at Michaels craft store (or, at least, they used to sell it).

I bought a large sheet of the stuff some years ago to make backing boards for grille cloth in cathedral and tombstone radios, and still have about half of the sheet left.

Of course, then you would have to deal with making the round holes for the authentic look.

As for the label, I might be able to come up with a scan, but I cannot do so right away - it will take some time as I'm frankly quite busy at present.