Ran out of the fatmat but got the majority of the cargo section covered. And it has made a big difference to exhaust noise in the cabin. The drone at 100km was very annoying but now it is barely noticeable. I will be buying more of this stuff and continue to do the rest of the cabin and the doors.
I couldn't tell you exactly how much it weighed, I had 25square foot and it would have weighed about 5-8kg, thereabouts.