Portal Frame Cattle Shed Design

I’m ready to move from concept to fabrication for a 60 ft-long × 50 ft-wide portal-frame cattle shed with 15 ft eaves. The structure will be in mild steel, so every calculation, drawing and schedule needs to reflect that material choice... (Budget: €30 - €250 EUR, Jobs: 3D CAD, AutoCAD, Building Design, CAD/CAM, Civil Engineering, Engineering Drawing, Welding)