@NeoHomesteader is going to hit a hard wall trying to keep a confined flock fed off what comes from such a small patch of ground. Number of chickens too high.
I wholeheartedly agree. I was thinking about what to grow and the timing, rather than the sheer quantity needed. But how many birds is "too many" depends partly on how long which birds are kept.
If someone keeps 6 hens and a rooster through the winter, then hatches 25 chicks each week for two months, they have 200+ chickens at one time in the summer. But if they butcher them in the fall they will need less winter feed than if they plan to keep 100 hens for the next winter. (Not recommending they try to feed 200 meat birds, just saying a small breeder/layer flock is much easier to feed all winter than a large breeder/layer flock.)