I suggest talking to your neighbors first. If you have a coop design in mind, maybe bring some pictures so that they have a better idea of what you are planning to build.
Do you have any feel for how easy your township is to work with? My county is terrible - the only way for me to have chickens is to ignore the ordinance. I have two acres with no immediate neighbors, so I am comfortable that I can get away with it. If any of your neighbors don't like the idea of chickens then your best hope is getting your township to add an option for smaller acreage - 6 hens, no roosters.