Hello,
I have created several similar systems, and can develop a solution for you very quickly using the CakePHP framework which enforces MVC design that will allow you to add additional components in the future with a minimum of fuss.
My bid includes requirements gathering, database design, and prototype frameworking to be complete in the first week. The system will be polished, hardened, and made ready for production in the second week, and I will assist in deployment and any last minute changes in the third week.
I look forward to working with you, and patiently await any questions you have for me, thanks!