Truss design

I am looking for someone to help me design a roof truss for an upcoming project. Specifically, I need to modify the existing truss to create more headroom. I have an idea of what the approximate measurements should be, but need expert guidance to ensure that the final design meets all of the requirements. Ideally, I would like this project completed within the month. The successful candidate must have a proven record in truss designs and be able to deliver a quality product with a prompt turnaround.