that is a door. the gen 2 and 3 doors have a lot of space in there. enough for an entire row of tiles. we use 3 boxes of tiles on top of the sound deadening in the doors. if you have the budget the tiles are a huge upgrade in sound deadening your doors. they retail for $330 for a box of 72. so you are looking at $1000 but if you are interested, i can see what i can do. probably save you a good amount if you are doing more sound stuff
I will probably need 1-2 boxes; as soon as my truck ships I will give you a call.
I will use soundskins or SQLaudio soundmat for the inside and outside of the door but I still have over 100sq foot of Dynamat Xtreme left over from other vehicles that I will use for the rest of the interior and again that's if I can find a subwoofer that has a minimal footprint on the flip side its probably the most difficult to install because of thickness and size of the sheets out of the box. I also wonder if Line-X can be put on top of lizard skin spray on for the fender wells.
Im sure you've heard of an anechoic chamber, even though its impossible by inherent design to seal the truck complete I want to try to something in combination or without the ORCA tiles...staggered Pyramid foam or grooved structure foam if I can find something that doesn't interfere with the window or anything else. Its worth a shot.
I will send you a PM sometime today