106pete wrote:Is that really what they're all designed like? May aswell use some scaffolding

They can look a bit agricultural eh?
I think you can get the aero bars, the main issue is feet that fit, but Thule do various types, for cars with channels, no channel etc. I'm sure you could get a combo that works, as the rubber foot shape on my 'dedicated' ones is really not complicated.
It will probably cost a small fortune to do that though...
I'm after the extension bars if anyone has them, BTW?