That looks like it once was a dog pen type with a chain link fence that got repurposed using chicken wire. You could go right over the top of that chicken wire with the 1/2" hardware cloth if the frame and door are strong. It sounds like they aren't, and you might have to start over.
You can attach it with plastic zip strips that are cheap, and use a good sharp side-cutters/dykes to cut it. I would go floor to ceiling with it. It comes in different lengths and widths so just pick which works best.
You can attach it with plastic zip strips that are cheap, and use a good sharp side-cutters/dykes to cut it. I would go floor to ceiling with it. It comes in different lengths and widths so just pick which works best.