Hi,
i have gone though the excel file and got fair idea about the application and would require more discussion on this to get better understanding.
i am full stack developer and have expertise in php, codeignighter and mysql with 7+ years of experience in IT.
I can complete this application in required time frame and will provide quality product with additional one month support.
i will design simple and easy to use interface but strong in functionality to cover your business needs.
Thanks,