I decided late in the construction to add wipers.  It then crossed my mind that motorised wipers would be really impressive!  Designing a mechanism to fit into the confined space around the transmission and below the bonnet line was challenging to say the least.  The resulting design uses a micro-motor located in between the chassis rails on the left of the car.  This drives a cam (actually a single section of engine crankshaft), which in turn moves a rocker arm.  This is connected via a ball joint and socket to the wiper rocker.

The resulting motion is a little more restricted than for the real car (the photos show the wipers at their extremes of motion), but it still adds to the realism of the model.