Thesis for IT, enhance my code + additional works

My project is simple. I have already a working php software(sales and inventory) build in codeigniter 1.7. You just need to : 1. redesign it ( I can give you the layout) 2. enhance the inventory system by adding just-in-time management (lead time) 3. add a time-in time-out for employees and connect it to a payroll system 4. create a simple website for it. (with shopping cart)