Here's what it looks like from the inside. It opens from the outside so I need to do something on the inside to prevent critters from getting in (our run is pretty secure but it's 2x4 wire on top so something *could* get in if it really wanted).
Would I regret it if I just nail/staple hardware cloth to the inside along those studs? (I'd use those construction hammer-in staples, not the staple gun kind, or maybe screws w/ big washers) or should I make something that is easily removable?

Would I regret it if I just nail/staple hardware cloth to the inside along those studs? (I'd use those construction hammer-in staples, not the staple gun kind, or maybe screws w/ big washers) or should I make something that is easily removable?