Here are some photos of my new Maruti S-Presso and our old 2008 model Wagon R. This will help you get an idea about the actual dimensions of S-Presso. Please note that the new Wagon R is much bigger than the old model. The old Wagon R size is almost similar to S-Presso's dimensions.
Front View
Rear View
Luggage Space
Boot Space with back seats folded
You can also read my SPresso review.