Nice run area for your girls. If the rhodies have already figured out to go in the coop, hopefully the orps will soon follow. At five weeks old they should be fully feathered in a couple of weeks or so and shouldn't need supplemental heat anymore even if it is below freezing. If you expect then to stay in the coop for long periods of time in the winter because of the weather/snow etc, I would consider putting a window or two in since it does seem pretty dark. With feed, if there is feed in the coop, since it is there when they wake up they tend to eat before they go outside and most will be willing to go back in during the day for more food and they do seem to learn to go in and out faster. If there is food outside, they do tend to eat that first. But as long as they are eating it is really whatever is most convenient for you.