3D Model dwg compatible

3D model required as per attached sketch wanted quickly for manufacturer. My client holds all copyright and patents so discretion is required and all files, drawings etc will become the clients property via myself. There are plenty of photos of the item and I will upload to sucessful bidder. Must be able to read in dwg format, so can be modelled in Revit, 3DSMax, Inventor etc but saved as dwg file.