Install New Site Design, Create New Features and Rearrange Admin Panel for Open Cart Marketplace Platform

Looking for developer experienced in Open Cart ecommerce platform utilizing multi vendor marketplace extension, to install/implement new design, add new functionality, and rearrange admin panel links and display. New design will be provided. Install homepage, my account, sign in, registration page links and functions to new design as well as incorporate the functionality of other pages affected by new design. New design should be theme for entire site. New features to be created are 1) auction system based on seller's product catalog, 2) post buying request system for buyers to list desired products and sellers to respond to 3) allow sellers to create order invoices, provide shipping rates and ship product before collecting payment at a future date 4) Friends/messaging/chat system with user profiles displayed to other members 5) Buyer/seller instant chat for buyers visiting seller stores 6) Ability for admin to track all seller transactions and invoice seller for those fees. In the admin panel, rearrange display and menus to fit the above requirements. Project scope requires user to install new design, create new features and change admin panel layout. Only freelancers experienced with open cart multi vendor modules should respond. Independent freelancers preferred. Payment will be through freelancer only and divided into equal milestones. After completion of milestones, payment will be released. All work must be completed on our server.