The difference between .3 and .35 would be neglible. Definitely out of audible range and nothing a few ounces of polyfil would take care of.
My opinion on the subject would be to make yourself a nice baffle, and seal up the door as good as you can before building an enclosure in your car. The idea of using the 'glassed foam baffle doesn't seem too bad. I wouldn't even mind seeing you try to put a aperiodic membrane on the back side of that foam baffle.
Steeda, we all appreciate your advice/help but don't get so upset about others comments.
