Its not only thin sheet metal, to reduce weight there are no protective beams in the doors, reduced Frame weight which collpaes if the car topples, "S" or lower rated tyres - I would not do more than 80-90 in an S rated Tyre, Smaller and thinner Brake rotors, cheaper suspension, ultra thin 165 section tyres. Maruti has been changing the suspension in all 2 year old Baleno's to whoever complains (No recall), they very well know most Baleno or other similar cars would have gone to 2nd hand owner by that time the car is 4 years old, when the previous owner will be blamed.
The light weight not alone the problem, the export versions are just a bit heavier. But to do well India Suzuki has to keep the cars at VFM
pricing as well, for Eg Swift in UK is probably priced on par with Fiesta in UK and Europe and 10-15% above the Ford KA+ A.k.A. In India they compete at the same price. To Build a Safe but light car you need expensive materials with Boron steel etc., but here to keep VFM
pricing you can't use such material.