Compact Concrete Farmhouse Design Needed

My farm property needs a small, under-500 sq ft retreat built primarily from reinforced concrete. I need an experienced construction engineer to convert this concept into a complete, build-ready package that a local contractor can follow without guesswork... (Budget: $15 - $25 USD, Jobs: AutoCAD, Building Architecture, Building Design, Construction Engineering, Drafting, Home Design, Revit, Structural Engineering)