Second and first from Permalink #9? The catamaran body shouldn't churn the air if it's smoothly finished. It may have problems with increase surface area in crosswinds. Note that aerohead's example and my third one use a 'wingtip' pointed downward to enclose the wheel.
Have you compared raising the cockpit edge toward the rear, rather than the drainage channels on the sides of the headrest. It seems like that would bleed turbulence rather than slicing it off.
Solidworks uses splines, see
https://en.wikipedia.org/wiki/Non-un...ional_B-spline. It is a parametric solid modeler as compared to a direct polygon modeler.
Why Use NURBS for Surface Modeling...? suggests that Solidworks is needlessly complex for what you are trying to do, compared to say Rhino 3D or Maya. But, use what you have.