Very interesting discussion.
In term of resale, price may decrease but not like Rs. 100000 like someone said when Punk got his entire Civic redone.
Legal issue, I personally do not see provided it's all documented. Nonetheless, the main authorities should be the best judge. Please make sure to see something written and not a verbal comment as no one honors them later or simply say, 'Ghalti ho gayi. Hun ki kariyay?'
Personally speaking if i were cautious like you, i'd go for https://www.pakwheels.com/forums/news-articles-driver-education-safety/169479-wrapacar-brabus-rockville-group-pvt-ltd. They MIGHT be able to help you there also.