Just a small note about mirror mounting. I think I am a proficient user of mirrors, I find it easier to park a car into a tight spot in reverse, controlling the clearances with the mirrors. Not so with the roadster. The mirrors are closer to the centreline than the outer edges of the rear arches, so you do not get a view of the car's outer dimensions in them. This way they are almost useless for maneuvering in reverse, you're better off turning your head and controlling the corners directly. Now, for normal highway use the height of the mirrors is more important, as the rear arches obscure the lower part of the view. Based on this consideration, window-frame-mounted mirrors should be more convenient, once we get around to fitting a windscreen.
I've also used cheap scooter mirrors with M10x1.25 threads and mounted them like so:
https://picasaweb.google.com/lh/phot...t=d irectlink
Looks like the position of the mirror ended up very similar to yours.