Bird netting is good only for birds. Coons can and will find a gap in it or, just tear right through it. Bird netting won't even slow down a big boar coon. In many cases raptors are able to infiltrate bird netting. Sometimes they are able to get in and are not able to escape. In these situations they usually kill even more chickens.
Hawks and owls love to attack from a perch. Two large pines seems like an advantage for raptors as opposed to a deterrent. Back in the old days, when it was legal to kill birds of prey, people would erect poles near their chickens with foothold traps on top to catch raptors.
Badbart, you are doing well. Just imagine the largest and smartest threat to your wife's birds and develop a strategy to keep these out. If you have any of the weasel family, don't leave even the smallest gap in your defenses. It is absolutely incredible how small of a space minks and weasels can squeeze through at full speed! And, they tend to kill everything they can catch.
I'm just wondering if the stuff you are stacking against the back of the coop is gonna be over buried hardware cloth. If not, predators are pretty adept at moving material like logs, rocks and dirt while trying to uncover their next meal.