Owls and raccoons, maybe possums would be my urban fear. Don’t know if you get weasels / stoats but we have them up here too. Florida has snakes, but they’re more a danger to chicks, right? I understand the call on risks that you have to make!
Is there any way to make a HC cover for the pop doorway to have some security and air too? I have wondered about this since we’ve been talking about whether we keep the door open or not. Best idea so far is to buy a replacement manual door and put a HC “window” in it. Or modify the existing one, but I’d rather both a summer and winter version, in the event the auto door breaks, but that’s maybe not a factor for you. Doing this would still keep the auto door functional and untouched. I’d have to look up the assembly, I don’t remember if removing it to work on (or installing a purchased replacement) means a big disassembly or not. How flimsy is it, would little bolts and washers work?
Hasps - what I did with the Cube, because I was concerned about drilling into the shell, which some people on the Omlet Facebook group do, was attach cabinet child-proof locks. People there have done both. They attached well by glue and are pretty strong. Didn’t work well in winter though, the sliders iced up. Had to warm them sometimes with my hands to make them work. Lasted a few years until the sun baked them and the straps broke. I hesitate to drill but I may. The hasps work with a carabiner in a loop over a flat latch. I’m ambivalent about it and still pondering.