Build a Classifieds Website From Ground Up or Using Open Source Script

Build a classifieds site from the ground up or using [login to view URL] open source code. Site must contain 100% of source code and be proprietary / no licenses. Core code should be php. All design specs will be included. Only the functionality will be required. Site design should be most similar to: [login to view URL] Functionality details of the site will be provided in length for qualified bidders. Functionality will be most similar to a car classifieds website. Site should recognize visitors location and show closest ads first as seen on [login to view URL] Visitors / users should be able to create an account for free, login, view account and post ads. Site url's, meta data, and descriptions should be generated according to the: Category pages - according to: - category title (car, truck, sedan, etc) Category pages filtered by location - according to: - category title (car, truck, sedan, etc) and location (city and state) US only Location pages - according to: - location (city and state) US only Specific Item pages - according to: - specific items title Admin panel of site should accommodate the following: - view listings in database - view users signed up - delete users and block ip associated with them - no payments gateway is needed