I think the cabriolet looks pretty tidy. It'd make sense to do as well, small cabriolets seems to be a pretty healthy market segment.
I'm not so sure about the RS1 idea though. There are bits of it I like, and bits I don't. I think the size of the windscreen and the angle of the roof/a-pillar are what's making it look a little odd to me?
Regards,
Rob.