Tim, Steve, you're seeing the same thing I saw initially. In fact, my first post was basically what Tim sketched,
"go back to the sheet metal shop and get some z-metal bent to hang it blind."
However, if you look at the photo, there's only one flange, and it's up; the only thing at this point, is which exposed fasteners to use. Something stainless, and with a good looking head. My preference would be a stainless button headed fastener.