DXF Outline for Cerbot

I am trying to start on some 3D printed and vacuum formed bodies for the Cerbot. I know there are 3ds and STL models for the entire bot (which are great), but I need a simplified outline showing just the base. The models have several hundred thousand facets and cannot be converted to solid models by any of the tools I have.

Does anyone have a dxf or other outline of the base available?