I would strongly recommend decoupage. It's surprisingly easy, and you could go wild using a printed fabric or paper. First strip off all the black material and sand the surface smooth. Then use tack cloth to remove all the dust from sanding. Then give it a coat of mod podge or the like. Let that dry and start to apply more of the same in a limited area at a time, smooth on the paper or fabric. When it's dry apply more coats. Instructions are on the bottle or there are probably dozens of youtube tutorials. The finish is very stable and resists water when it's dry. It could be used inside the case, too, in case there's water damage there.