It is heavy enough that it isn't being lifted by my kids or any animals, its ~80 pounds + the weight of the feed and five gallons of water hanging from it on an extra board I added across the top. Those roosting bars are only a couple inches wide, but I can improve that. They are 2' long each, so that's enough for qty=4 by your measurements, just need to make them wider. Maybe we'll just eat the biggest one and keep the other two if it becomes a problem. It's definately advertised as "Sized to comfortably house 4 hens" http://www.homedepot.com/p/SummerHawk-Ranch-Vintage-Red-Barn-Chicken-Coop-33554/205745336
The food thing may be a problem. I think already they've stopped eating feed completely
Follow ups - The coop is the secure shelter that they roost and lay in, run is outdoor space.
- Space- Medium sized breeds, like Leghorns, Andalusians, and Hamburgs need about 4 sq ft of coop space and 10 sq ft of run space per bird. Larger dual-purpose breeds need about 5 sq ft of coop space and 12 sq ft of run space per bird. Bantam breeds only need about 2 sq ft of coop space and about 6 sq ft of run space per bird.
Your coop/run is adequate for about 3 or 4 bantams, or 2 medium sized breeds.
- In regards to eating the birds you have a starting over with smaller birds- Bantams are not usually available as sexed pullets. They are normally straight run, which means you will have cockerels. Also, little chickens lay little eggs.
- Roosting space- you need about 12 inches of linear roost space per adult bird. And roosts need to be large enough for their feet. Most standard sized hens need about 4 inch wide roosts. Most bantams only need roosts about 2 inches wide.
-Regarding treats- Feeding too many treats will cause them to eat less feed. It can get to the point that they refuse their feed and wait for the goodies to show up. Not eating enough of their feed can cause all sorts of nutritional deficiencies. That can lead to bone and growth deformities and feathering picking. I know it's fun to see them gobble up all those left overs. And I know they love that stuff. But it's like giving candy to children. They love it, but it's not going to keep them healthy and growing. Limit them.
- Nope, no magic anything that will keep a determined chicken from getting to where they want to be. Fencing is a must.
- The big issue I see with your cute little pre-fab coop, is security. It's light-weight, which makes it easy for predators to target. Ask your kids if they can lift an end up. If your little ones can raise an end, a raccoon could flip the whole thing. Can your kids work the latches? Raccoons have opposable thumbs. If a small child can work the latch, a raccoon can too.
It's adorable, and I'm sure it cost a fair bit of money, but it's just not a safe place for such edible birds. Prefabs rarely ever are a good idea. My advice, build something that will be appropriate for the birds that you have. A simple 4x4 box out of plywood and pallets will give them more room, and will be safer, stronger, and longer lasting.