Nick
If in your first question you mean go for another colour, (anthracite?) then that's down to taste. If you're sticking with silver do be careful as there are lots of different colour silvers.
Don't believe the wing mirrors fold in, or if they do I've never seen how to do it!
Would expect it to fit in a single garage. The S1 looks wide because it sits low and the cockpit is narrow. It's also wider than the Trad Mogs. However put it next to a modern car and you'll realise it's still not a big car.
Cheers