On your queries, PM Navnit013 who owns a Grande. He will be able to guide you on the Grande. Below is his ownership link. Tata Sumo Grande MK-II Ownership Review
With regards to the modifications, bit on chrome on the front grill and putting Projector HIDs and some trendy Alloys will change the look of a Grande drastically and will definitely make it look Hepp.
All the best on your search and mods.