332185 Custom Wordpress Plugin / Menu

I have 500 cities which I would like to add to my wordpress site, however each city needs to have a custom header/sidebar. Please view: [login to view URL] As you can see the site is currently customized for Atlanta. I would like to be able to (through the plugin) add a city( such as NewYork) and produce this: [login to view URL] Complete with the premade content/header/sidebar which has been customized for NewYork (so in the example all forms of "Atlanta" will be changed to "NewYork"). I must have the ability to add more content to the page once it has been created. The page is made with the Thesis design. Each page/post will have to count as new, it can't be a masking process. The project must be done asap.