I wonder if you could cut down on your predator problems by letting your largest predator patrol your property at night let them do your predator work .just make your pens so they cant get in and let them take care of the harder to keep out predators.of course they wont be able to kill eagles and owls and such so your still have to build to keep them out! If you have coyotes now there would be your best friend as far as keeping the other predetors under control.