Sound Treatment "Space" in the Floor/Door/Rear/Roof?

Getting ready to start some serious sound treatment in my 21' Taco, and wondering how much room I have for sound treatment. I'd like to order the right thicknesses without having to tear the truck apart first.

Questions (and what I'm wanting to add):

1) How thick can I build up material under the carpet? (3/8" thick CLD, CCF, & MLV)

2) How much room is between the outer door and the window? (1" - 2" CLD & Sound Absorption Panels)

3) How much room is between inner door, and the plastic trim panel? (1/4" to 3/8" MLV & CCF)

4) How much room is there from the back wall, to the cross beams? (1" - 2" CLD & Sound Panels)

5) How much room is there from the cross beams to the back of the plastic storage bins? (1/4" - 3/8" MLV & CCF)

6) How much room is above the head liner to the roof? (1 3/4" CLD & 3m Thinsulate or Melamine)

Thank you for any help!

PS. Here's some videos of what I'm wanting to do

Door Absorption Panels - https://youtu.be/fp71lSN_hH4
Floor & void stuffing - https://youtu.be/FuGLAjcoYls
Roof Thinsulate - https://www.youtube.com/watch?v=ww0eH-_p6dY

 

I have a 2018 sr5 and I've found over 90% of my road noise is from wind intrusion on the door seals. The rest was solved with new tires and suspension (I was still on original tires shocks and struts at 61k) Not sure what you're trying to achieve with sound deadening materials but I have a feeling it's going to be a waste of money past a certain point due to how bad the door seals are on these trucks. Anything above 50 mph and I can hear the wind over my music basically and I'm not running stock speakers because the stock sound system was weak as heck.

You're really going to see extremely Diminishing returns basically past a small percentage of tire and road noise reduction which will probably be marginal at best.

 

https://www.tacomaworld.com/threads/sound-deadening-layers-how-much-is-too-much.738852/

 

I didn't do measurements but 80 mil Noico butyl base layer covered by 150 mil Noico closed cell foam worked for inside the doors (back side of the outer door skin) and the back wall with no issues.

Under the carpet I did 80 mil Noico butyl base layer and 300 mil Noico closed cell foam. I did run into issues getting the plastic trim along the door jam and the plastic covers that go over the seat bolts back on due to the thickness of the foam. So I had to trim back some of the foam. If I did it again, I'd stick with 150 mil foam. So definitely pay attention to where trim pieces clip in to avoid interference issues.

The above made a difference and I didn't do the roof. A lot of noise comes in through the vents in the rear wall. You DON'T want to seal those off as they are critical to equalizing pressure in the cabin. Some people use a foam prefilter like you'd use on an air conditioner (can buy it for cheap at home depot, etc.) to loosely cover those vents to dampen noise while still allowing air flow.

 

Any one else have any insight? Theres gotta be lots of people who have dont sound treatment that would have an idea how much room there is.

 

I did Siless 80 mil butyl with 157 mil closed cell foam on the floor and still found that the trim was a PITA to get to fit. I would've trimmed it farther back if I did it all over again. I also did the doors and rear area with the same sound treatment worked wonders for the truck. A helluva lot quieter now.