How about trying to make something like this?
https://www.backyardchickens.com/articles/mini-coop-or-integration-pen-from-a-large-dog-crate.76593/
Or even this:
https://www.backyardchickens.com/articles/outdoor-broody-breaker.76592/
I'm sorry, but there is no getting around the fact that the little box you have isn't a coop at all. It's maybe big enough to convert it into 3-4 nestboxes when you build your coop, but it is not only barely big enough to technically hold ONE chicken, it hasn't any room for a roost and has no ventilation.
The Usual Guidelines
For each adult, standard-sized hen you need:
I hate to disillusion you because I know you're trying very hard, but there is absolutely no way to make that little box work no matter what you do with it.
https://www.backyardchickens.com/articles/mini-coop-or-integration-pen-from-a-large-dog-crate.76593/
Or even this:
https://www.backyardchickens.com/articles/outdoor-broody-breaker.76592/
I'm sorry, but there is no getting around the fact that the little box you have isn't a coop at all. It's maybe big enough to convert it into 3-4 nestboxes when you build your coop, but it is not only barely big enough to technically hold ONE chicken, it hasn't any room for a roost and has no ventilation.
The Usual Guidelines
For each adult, standard-sized hen you need:
- 4 square feet in the coop (.37 square meters)
- 10 square feet in the run (.93 square meters),
- 1 linear foot of roost (.3 meters),
- 1/4 of a nest box,
- And 1 square foot (.09 square meters) of permanent, 24/7/365 ventilation, preferably located over the birds' heads when they're sitting on the roost.
I hate to disillusion you because I know you're trying very hard, but there is absolutely no way to make that little box work no matter what you do with it.