145 mph Wind Load calcs for tie downs to a shed

I am looking for help with a project that requires 145 mph wind load calculations for tie downs to a metal shed. The size of the shed is medium (100-200 sq ft). The tie downs need to be included in the calculations. I need an experienced engineer to provide wind load calculations for the tie downs to ensure the safety of the shed in high wind conditions. With my project, I am looking for accuracy and precise calculations to ensure this metal shed is well secured against high winds.