clone of craigslist site

I have the need for a clone of craigslist.com. I need for the look and feel of this site to be very close if not exact to what is on craigslist.com. All features of the craigslist site need to be present. Features like: 1) complete control over the categories, subcategories, regions, locations, etc, 2) PayPal enabled to process paid listings, 3) ability to make multiple categories and their subcategories Paid Listings, 4) calendar of events feature, 5) discussion forum, 6) photo upload with posting, 7) ability for users to admin their listings, 8) administrator can choose to verify postings or just allow them to post without the need for verification. An online admin interface to manage the site should be included with this web application and password protected. I am open to any scripting language that you prefer to use but I would prefer it to mimic the HTML of craigslist.com. Upon completion of this project, complete open source code will be provided to me. No files are to be encrypted. If you have already done a similar programming project to completion, please provide a link to that for me to demo. I will only pay through the escrow system of this site. I look forward to hearing from you. Thank you for your time. CG