Engineer 12x40 Trailer Frame

I’m ready to move my 12 ft × 40 ft trailer-home project from concept to engineer-stamped drawings and calculations. The layout is largely set, but the structural backbone—the light-gauge steel frame and the continuous precast concrete footing—still needs a seasoned structural engineer’s touch... (Budget: $250 - $750 USD, Jobs: AutoCAD, Building Architecture, CAD/CAM, Civil Engineering, Construction Engineering, Engineering Drawing, Mechanical Engineering, Revit, Structural Engineering)