I highly recommend building your own coop. It will last forever, you'll save $$$ and it's satisfying to say you built it. I've only heard horror stories about store bought coops. A coop you build will be built to last and will suit the need of you and your birds. After a few additions to my coop, I can leave for over a week knowing my birds are safe from predators and have enough food and water to last about 2 weeks.
I installed cameras in my run and my coop so I can watch them whenever and from wherever:
Foscam Security Camera
I also installed a light and fan (hot nights in FL) connected to Wi-Fi plugs, so I can turn them on from anywhere. I can also set timers on these plugs so they turn on and off at specified times. Here are the plugs:
Gosund WiFi Plugs
My run door is automatic and is set to open 30 minutes before sunrise and it closes 30 minutes after sunset. I used this one:
ChickenGuard Extreme
My run is completely covered with 1/2" hardware cloth, so predators are not a concern although there are lots around: barred owls, foxes, raccoons, opossums, snakes...
Building your own coop gives you piece of mind knowing it's built to last and that it meets the shelter, safety, food, and water needs of your birds.
Here's my design and build video that may help to give you ideas. I also put together other videos showing things like building my feeder and my waterer: