We tend to have issues with mice. I think my entire flock may be defective lol. Turkeys and chickens will just watch them run by. I used to have 1 hen that would actively Chase them but she recently passed away. She was a CX mix so she couldn't actually catch them but if I caught one in a trap...
I say build! While it can be totally frustrating, it is so rewarding in the end. My husband and I built our coop and run together. Neither one of us had any experience or any idea what we were doing but it turned out great! It's been about 4 years now and it hasn't collapsed yet! Here's a link...