OP here--Do you think it would be possible for me to predator proof the setup? I can find someone to feed/water/check on the girls. Not sure if I can find someone to come over early and late to let in/out. Our neighbors installed a 6 foot privacy fence when we got the chickens, if that tells you anything about the chicken love around here. And local family will all be on vacation with us.
Maybe an automatic door, and maybe a couple of cameras you can check from wherever you will be?
That way the automatic door could let them out and shut them in, and you could look through the the cameras to be sure it was open/closed at the right time, and check that they haven't spilled their food & water. Then have someone come over a few times to refill the food & water.