X2
I sometimes put things too close together in order to maximize use of space. Just as an example, I've had some storms bring down trees and huge branches requiring things to be rebuilt and it is much easier if there is room to work. One of my pens was a big chain link dog pen partly covered...
Not sure what it is but if it is fiberglass or plastic, it isn't nearly strong enough.
Hardware cloth and expanded metal are both strong enough and with small enough openings to keep the smallest predators out.