Wow, that looks like an interesting article - I'll read that when I get a bit more spare time. The reason I was thinking about the roof line is that it's clearly visible (at least for other cars) while I'm driving along. Making a buck to stick on the roof will be fairly easy (I know where there is acres of high density polystyrene).
I intend to smooth out under the car at some stage also, but need to find a cheap source of sheet metal, or reasonably tough plastic. I doubt anything less would pass the 6 monthly warrant of fitness inspections here.
Other ideas I'm mulling over at the moment are to extend the roofline some, extend the boot lid, or raise up the bonnet - as well as the usual items like side skirts and wheel covers. Cost is the main factor (isn't it always)
