[hybrid_vision]

I don't think the conversion would be an issue, it's pretty straightforward to import a CAD model into i.e. Maya or Blender and from there output it to a game-engine-friendly format.

Still, I'm not sure I entirely understand what it is you have in mind. What do you mean by messing around with drawings and test driving components (to which I assume you mean parts of the robot, and not a whole robot like what Catalyst does), and why does this require using a game engine?