clone my own joomla site

hello I own this site [login to view URL] I need to clone it 20 times, for 20 different domains. each clone: a/ clone the site. b/ put different picture in header in order to change the general look of the site. c/ site title, metas, and bottom text of main page will be provided for each site. It will be unique for each site. d/ central database in order to display same properties on all clones. I will pay 10$ per clone. Each clone will be paid when verified and accepted by admin. To begin with, there is 20 clones, but we planify to make hundreds of clones, in order to rank on different keywords. payment will be made through paypal only. 10$/clone, only after work done, and paid after each clone, one by one. happy bid.