Thank you for your kind reply. Yes, we will need to rethink our set up. I do agree it should include a cover obviously. Unfortunately we found that out. I am kind of in shock and will need some time.Oh, dear that is terrible. I am not familiar with your predation risk.. could be large cats(and i don't mean the kind that snuggle in your bed) sadly quite a few predators can climb.
Are you able to reinforce your existing pen? perhaps a roof? you can get your remaining some buddies, i know in the state of shock your in.. but it doesn't have to mean you get out of keeping them entirely.