A great idea! When I fought my fight in Washington County, PA in '04, I came across a PA Superior Court decision that stated that minimum lot size requirements for certain types of land use in zoning ordinances in PA had to be reasonable in order to be constitutional (is it reasonable to require 1 acre for 4 hens?). Our lot requirement was pretty extreme - 5 acres for any poultry whatsoever, even one serama roo!
Did your township cite you or just tell you? Did they give you a time frame?
Can you get a copy of your local zoning ordinance? They have to provide you a copy by law (they can charge for copies), and it might be available online for free. In PA, the law library in your county courthouse is supposed to have a copy but they aren't usually reliably up to date. Your first job is to know that ordinance backwards and forwards. It can frame your whole attack & makes sure you don't miss any procedural stuff. Get that ordinance, and if you want any help w/ reading or interpreting it, PM me. I've been down this road before, in the same state. I understand the law and strategy (PA attorney here offering some advice for free). I strongly believe that wherever you have the right to have a garden, you should be allowed to have some chickens. If you have Q's or want me to look at your ordinance and make some suggestions, PM me. Krista.