Back in July 2011, I worked with Google Sketchup to create a protective shell for the Flying Blender. I created a 3D model of the Arducopter and then modeled the shell. I envisioned using layers of 4 mm Expanded Polypropylene (EPP) foam commonly used in the construction of radio control airplanes. Here is the Google Sketchup view of the design. This was never built.