Ah kitties, the evil darlings!
If you're not handy with metal, I have a suggestion for an alternative to this, which may or may not work, but it might be worth a try... A friend of mine recently picked up some contact paper at Target that looks almost exactly like brushed metal. Honestly, it looks pretty good! (Not like that fakey faux wood stuff.) I wonder if you stuck the contact paper to the couch around the corners, it would look almost the same as this and be protective in a similar way. Maybe not quite as stylish though!
Good idea! That could also be practical for counter edges instead of using tin foil or anywhere else you want to quickly put up something to discourage them.