Nice project! Your monobody design & outrigger wheels should offer a good compromise of great aero numbers & stability. Here's another oldie analogue of Nissan Design America's Best in Design @ the (unfortunately defunct) 2005 Extreme Gravity Racing Series. The Flying Torpedo was a welded truss structure with FB body shell & wheel covers. Not only those it offers the least frontal area, it also has a full wrap-around visibility and offers full roll over protection.
Gravity Racer