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The VW heads won't disturb like a radial ( more like a J-3 Cub ) but will degrade the Cd.
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That's quite a jump in Cd. Assume 5-7 cylinders, that's 2 1/2 to 3 1/2 times the frontal area of 2 tandem cylinders, twice. So 0.22 becomes 0.07 increase?
That's not so bad and where the Cub has a narrow cabin. the eco-lakester would have the cylinders at the stagnation point of a bluff body with 10:1 blister recesses to capture, channel and reattach the turbulence.
I'm going out to the country to work on the VLVW but I'm starting to think that everything it needs—powertrain, wheels/tires and roll cage would get better results in a purpose-built body.