freelancer script modifications, GAF features

Hi, I have a script similar to sobftbiz freelance script in PHP. I would require following additional features/modifications: -) adding an Escrow system similar to [login to view URL] -) adding a private message system and to upload files similar to GAF -) ability to upload a file when posting a project -) ability to hide the biddings from other users simliar to GAF -) no separation btw/ webmaster and programmer as users -) including latest won/lost biddings in the review ratings similar to GAF -) Including bronze/golden memberships -) including featured/non-public project properties. -) some other small modifications. You are welcome to offer new practical features. Service providers with experience in similar freelancer projects will be preferred. Please provide reference. Lowest quality bid will win.