Outdoor Steel Bracket Design

I need a sturdy bracket designed for 50x50 tube steel. Its primary purpose is structural support and it will be installed outdoors, exposed to moisture and rain. Key Requirements: - Must be designed to withstand outdoor elements, especially moisture... (Budget: $30 - $250 NZD, Jobs: 3D CAD, 3D Design, 3D Modelling, AutoCAD, CAD/CAM, Civil Engineering, Mechanical Design, Mechanical Engineering)