Exterior Shape Adjustment for 3D Model

I already have a complete 3D model; however, the exterior lines and proportions are slightly off. I need someone to jump into the native file, focus solely on the external surfaces, and refine the shapes so they match the reference drawings I will supply... (Budget: $30 - $250 AUD, Jobs: 3D Animation, 3D CAD, 3D Design, 3D Graphic Design, 3D Modelling, 3D Rendering, 3ds Max, Blender)