@ chinyoti
thanks
@ mani1
if by "crossovers" u mean that outer ring type thing, then Yes they where placed and they used Screws.
As for plastic covering inside the front doors... it is perfectly fine. This is not the first time i hav openned that plastic covering in a New car. I hav always installed Sound system in my new cars. and NEVER EVER it has caused any problem in ANY car.
rattles and sound depends on quality of work. My car does not hav any rattle sounds. just make sure to get the work done from a guy, who knows what he is doing.