Build a Website same as given

I am looking for a developer to take on a project to build a SAAS project management system. The system will consists of Projects and Users. A main user signs up and add projects, assign new or existing users to projects in a number of rights (Viewer, Contributor, Admin) levels, etc. Each project has a tab for Discussions, ToDo Lists, Files, and Documents (pages that can be edited via a WYSIWYG editor for sharing info), and Billing (An area to track billable items and generate invoices). When a user logs in he/she would so a list of all projects they are on and under each project a list of all tasks assigned to them. This would be provided for a monthly fee based on the amount of document storage used. So, the ability to sign up and select a plan is required and integration with paypal. Please send samples of web apps you have done in the past to show both coding and artistic abilities. Must be done in MySQL with PHP and JS.