If you can rig up one foot of roosting space for ten hens, that would be a perch ten feet long, or two perches five feet long each, you could make the tiny coop work, but it doesn't appear big enough to handle that requirement.
As for the hen who was dirt bathing and getting her feathers plucked, try not to worry about either her behavior or the plucking behavior of the others. That's normal social behavior while dirt bathing. The others probably were simply getting carried away. Watch them over the next couple of days, and you will be able to see if this is an actual problem that is developing.
Feather picking is a complex issue with many causes. It's a mental habit as much as nutritional. Sometimes you can discourage it if you see a hen picking feathers and you flick her on the back of the head with your finger. Keep close watch on them, and interrupt the picking when you see it happening, and you may be able to nip it in the bud. After they develop the habit, it's a real nightmare to get them to stop.
As for the hen who was dirt bathing and getting her feathers plucked, try not to worry about either her behavior or the plucking behavior of the others. That's normal social behavior while dirt bathing. The others probably were simply getting carried away. Watch them over the next couple of days, and you will be able to see if this is an actual problem that is developing.
Feather picking is a complex issue with many causes. It's a mental habit as much as nutritional. Sometimes you can discourage it if you see a hen picking feathers and you flick her on the back of the head with your finger. Keep close watch on them, and interrupt the picking when you see it happening, and you may be able to nip it in the bud. After they develop the habit, it's a real nightmare to get them to stop.