Composite Privacy Fence Engineering Certification

I need engineering-certified documents for a 3.5 meter tall composite privacy fence. There would be two parts to the fence - one 6 meters long and one 8 meters long. It was suggested to me that we use... (Budget: $10 - $600 AUD, Jobs: AutoCAD, Building Architecture, Building Design, Building Regulations, CAD/CAM, Civil Engineering, Construction Engineering, Construction Management, Engineering, Structural Engineering)