We have been doing this project. We have completed more than 70% works so far. You can check the status of development till date going here:http://joinnick.com/developmen
We are making this platform using CakePHP. Now the work for you is to complete the system up to specification.
Here are the spec: https://www.dropbox.com/s/0971ctan
Please come up with a plan and let us know how quickly you can complete this project according to the spec. We need to complete this as quick as possible.