Disclaimer: I haven't done one.
It looks pretty straightforward. I would otherwise finish the knife, with nice flat facets for that part of the handle. Get a thin piece of nickel silver cut to size, leaving it a little longer than you measure around the handle. Set the folds, trim any excess. Then I'd epoxy it and lightly peen over the edges like in your picture. I wouldn't overhang it much, or peen it too much. You can already see in the photo that it could get sloppy looking.