That sounds about right, depending on breed. If you want higher production (and maybe fewer birds, to maximize feed to egg ratio) you could go with production hybrids, but their production period and lifespans may be shorter compared to a heritage breed (hence the commercial farms cycling...
It's too bad the coop isn't bigger for your convenience... the chickens won't care but you'll likely find it tiresome having to fold yourself to get inside it.
I assume the coop width you listed is strictly floor space, not including the 2 banks of nests? I'd likely remove nests on one side as...