This seems like a strictly a short term use project. It may work for meaties, but for longer-term residents, you'll need more "meat" in the coop!
The design is solid for a protected area with no predators. Surrounding it with an electric fence may not always work, as many predators can get past a standard electric fence.
A little extra weather protection would protect the birds from winds and blowing rain. It would also give them a dry place to sit.
Using the old swing set seems like a good idea, at first, but exposing food birds to all that pressure-treated lumber could be potentially dangerous to your family. Pressure treated lumber really needs to be sealed.
Chicken wire is made for keeping chickens in, not predators out. Hardware cloth would be a better choice.
Even meat chickens need some enrichment. A couple of perches and a few boredom busters might keep the chickens from messing with the wooden boards and make for happier, cleaner, healthier birds. And that means a better meal for you and yours!
On the positive side, this is a great way to reuse an old swingset. It looks sturdy enough to easily move around the field to green grass and it would be pretty inexpensive to build - all pluses for the backyard chicken owner!
