While aerodynamic it doesn't look very comfortable for an extended ride. The neck bend is pretty tight, into oncoming wind and add in a helmet, eeesh. A head rest would transmit vibration and road shock directly to the helmet.
Good effort though. The lay-down position reduces the riders drag significantly. The rider in an upright position, appears (to me anyway) to be one of the largest contributors to drag.
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Good design is simple. Getting there isn't.
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