CMS builder, custom made

The CMS should include the following options: - Porfolio of categories (such as websites and online shops letters) - Pages with the possibility of sub-pages (when we can on our team, our office etc. are added) - Customers should be able to login and submit new bills to place orders - View Guestbook and to post - Slider (in header) - View Gallery - See FAQ - Contact - News View and respond - Houses and search (by price or location) - Sitemap automatically generated The admin panel: - Pages Create, edit and delete - Add and remove categories Portfolio - Portfolio add items, edit and delete - Customer View and add clients, delete clients - Invoices give customers (customers receiving an email + they are in their account - Manage Guestbook - Slider control - Managing FAQ - Manage Gallery (in categories) - Newsletter to clients - Analytics link in backend - Contact management (add fields, edit and delete) - Managing News - Real Estate Add, edit and delete (management classes) Everything must be modular, with a config file I can turn modules on or off. Using a simple template system in PHP. I have already a template for the website and for the backend