Modifications to a PHP Point-of-Sale script

I have purchase the phppointofsale from the coders website where it enables me to have the modifications I required made to it rather than having them cloud host the product. Whilst their system is great, there are modifications required to suite my business needs. I have tabled below the initial modifications. There are further modules to be added, but this list below is required to be fully operational (after testing) by July 1 2015. These modules will include Expenses, Payroll, Email, and additional reporting screens. This project is being relisted from the original one as the initial project had more requirements but not enough time to complete, and secondly several freelancers had quoted without reading the requirements. I do have the source code and will provide respectively. In the meantime, please check out the [login to view URL] and click on 'demo' to view their system, and read below the requirements I require. I have a rough understanding of what the cost should be, and if the successful freelancers quote is reasonable, then there is a good chance they too will get to create the other modules I require. I can't stress enough, this project has a deadline and I must have a fully operated & tested system by June 30 for implementation on July 1. The requirements below should be only a couple of days work to be able to show me a working model on your server. I would prefer to split the payment into 3 (initial, completion and on receiving all the files). (please see attached document for the requirements)