Skillion Roof Design for 150m²

I need a complete design for a residential skillion roof that will cover a radial floor plan of roughly 150 m². The structure beneath is already laid out, so what I am after are the roof-specific documents: layout drawings, framing details, and the structural calculations that prove the concept... (Budget: $30 - $250 USD, Jobs: Architecture, AutoCAD, Building Architecture, Building Design, CAD/CAM, Drafting, Revit, Structural Engineering)