If you think SolidWorks is rubbish for surface modelling....... you haven't used ProEngineer. Honestly there is nothing worse then ProE for surfaces IMO. Just a couple of days ago I was modelling the most basic of wing planforms and I was getting crazy results. In fact I'll show the result:
Using same aerofoil section, only at a smaller chord and thickness, it decided the best surface plot involves this crazy crease in the wing. After plotting 20 sections and still no real cure, I ended up photoshoping the images for the technical report and drawing the wing itself for the CFD analysis again using gambit! If only everywhere had Catia...
Anyway this brings me onto the whole reason I made the post, aerodynamics. What kind of speed are you looking at getting? The whole car seems like it will have a lot of flow under the body. I just wondered what the lift coeffcient would be, potentially quite high... which might not be a bad thing for a a car of this design? The Cd0 should be low for sure, and providing any lift generated is perpendicular induced drag should be low to.
Good luck with Floworks, it's very easy to use. Just be very careful setting up the atmospheric conditions. I found every time I loaded the file, even a full case study, it would not remember the atmosphere so had to type it in a lot. Fluent is the same as well for some reason. Very interesting project indeed, hope you keep this thread updated.