I have read your project description, i understand what you want, and i would like to offer you my services. I have strong knowledge of Wordpress, including themes creation with administration panel, that allow users to make changes in the design without any changes to the theme files (CSS style sheets), and responsive (mobile/tablet) support. It's also possible to use the lincesed website you already have if fitting your requirements and the design, to decide i would need to review your designs, and the application. Feel free to contact me by private message to discuss the details. I'm looking forward to our cooperation.