I would hesitate to go any lower than you have already; generally, there's a "sweet spot" where CD goes down as the body is lowered, but rises again with more lowering. According to the aerodynamics textbooks I've read, this is somewhere around 0.75 body cover:1 wheel diameter.
Mirrors will be your best bet. That underside looks very good for a production car already, but you may be able to cover the opening at the front subframe and behind the motor at the rear (or is yours a REx?).
Good luck! There are a couple of these running around my town, and I love seeing them--especially since the carbon fiber used in the body was manufactured in my hometown of Moses Lake.
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