Gravity Retaining Wall Design

I'm seeking a professional to design a gravity retaining wall using 8" modular block Keystone blocks. Key requirements include: - Design for 4 to 8 feet height - Use of modular block Keystone blocks... (Budget: $250 - $750 USD, Jobs: AutoCAD, Building Design, Building Engineering, Civil Engineering, Construction Engineering, Construction Management, Mechanical Engineering, Structural Engineering)