My coop, now delivered, has three sliding bolt latches on the outside; one to a walk-in person door ( to the run) and one to a coop access cleanout: large door, on the back-end of coop not protected by run, and one on the nesting box (also to be accessed outside of the run). All latches are about three or four feet off the ground. The coop is very heavily built and solid. I will be putting hardware mesh over the window...etc etc. In the interest of predator proofing as much as possible, is there a way to retrofit this sliding bolt latch to make it more secure? I have racoons in the area and I wonder if those locks will really be safe....also thinking about putting another bolt towards bottom of the person door... I don't really like these sliding bolts...I was hoping for a latch I could slip a small carabiner through. Any thoughts, preferences, what has worked for you???? Or should I post in coop design forum?