Gomog, you seem to have missed the point of Dave W's contraption. The clue is in the word plough. The idea is that it might sweep away a small obstacle, there's no claim that it will absorb head on impacts. Anything that reduces the anxiety of minute road clearance on the early roadster is definitely a good idea.
In my opinion the sump being so low on modern Mogs is driven by the legal requirements to increase the distance between the bonnet and the top of the engine...to protect any pedestrian who finds themselves resting on it suddenly at speed.
Nick
