Order Book / Trading Platform

Hello, I need a Trading Platform for virtual currencies. This would include user/pass accounts and captcha / pin Currency Balances (and the ability to add new currencies and set rates in backend) Input a buy or sell order, live order book, create a trade engine that processes orders and updates balances. Deposit funds ability (JSON API) to program daemon running in background (communicate with the daemon and post generated deposit address or whatever communications needed - i will give you a copy of the api manual.) Transfer funds between users. Create a "Code" that can be redeemed for funds. Security is a absolute must, simple and safe. The ability to process the exchanges quickly is also important, we need a very efficient system if its going to be php/mysql. So basically just a system where users have currency denomiated balances, and can make market orders to buy and sell the various currencies from eachother, and the system charges X fee for each transaction. Please let me know how long this would take, thank you.