I am in CA, too, with similar temps (Nevada County). I love the idea of an open coop! I really like your set up, honesty! I have a big shed I converted for my 12 chickens and 5 ducks, but what you have is great!
However, I agree about making it more predator proof. Chicken wire won't stop a raccoon or any other determined predator, like dog, bobcat, coyote... If they aren't sleeping in closed coops, you really should beef it up. But I totally 8nderstand about added expense. I've shelled out some serious ducats to keep my flock safe - more than spent my goats, even! You might check Craigslist or FB Marketplace for woven wire or hardware cloth. I find the darnedest stuff on CL.