All respect to aerohead but I'd follow Mair rather than Hucho for the A-arms, for less frontal area.
Wrap the front tube, flat between the tubes and a nice tapered trailing edge. The outer extent of the trailing edge will be limited by the wheel-and-tire swing in near-side turns but the trailing edge could be angled to increase the fineness ratio. The trailing arms would start to act like fences, breaking up vortexes down the side of the car.
Are the steering linkage and brake line above, below or between the upper and lower arm?
Here's the best open-wheel treatment I've seen:
[Imgur is running around with it's hair on fire, I'll edit in the Mariani Farms roadster later]