Consumer Electronics Enclosure CAD Design

I’m preparing a new consumer-electronics device and need its outer housing modelled as a single, well-engineered mechanical part. The focus is solely on the enclosure: wall geometry, snap-fits or screw... (Budget: $14 - $30 NZD, Jobs: 3D Design, 3D Modelling, AutoCAD, CAD / SolidWorks, CAD/CAM, Manufacturing Design, Mechanical Engineering, Solidworks)