i remember my cousin in village who is doing these kind of experiences. Trust me once he closed the sunroof of Nissan by putting steel sheet with some potine work because he don't like the sunroof. in rainy season there is leaking from edges inside the car really i am laughing like any thing by his creativity and he is very satisfy and saying "yar thori se kaser reh gai hai roof main" inshallah i will cover it.