Hello! I'm also from Croatia and welcome to BYC! So glad somebody else from here joined. (Btw, where do you live?)
The barred ones are plymouth rocks or plymouth rock crosses. That is only barred breed you can easily get here. Also the red egg layers are the production reds and are hybrids and that is why you have various colors of their offspring. That brown striped one isn't amerucana 'cause you can't find them here. You can get green egg layer but that happens rarely.
I would also say that you have only one rooster. You were lucky. Very lucky.
I would also like to see your coop when it's done.
The barred ones are plymouth rocks or plymouth rock crosses. That is only barred breed you can easily get here. Also the red egg layers are the production reds and are hybrids and that is why you have various colors of their offspring. That brown striped one isn't amerucana 'cause you can't find them here. You can get green egg layer but that happens rarely.
I would also say that you have only one rooster. You were lucky. Very lucky.
I would also like to see your coop when it's done.