3D Model of Walk-Through Metal Detector

I need a professional 3D modeller well-versed with STL file format to create a medium detailed representation of a walk-through metal detector. The model should incorporate accurate height, width, and depth dimensions, with the intent on perfectly striking a balance between performance and resemblance. Skills in 3D Modelling, Engineering, Product Design and Computer-Aided Design (CAD) will be highly appreciated.