Down to two panels, FFR sharpie numbers 15521 (9" x approx. 5") and 13637 (approx. 8" x 5") Pictures should be attached help needed on where to install MK4 roadster, IRS and Coyote 5.0L M and M boys

It seems like most OEM cars have pretty much everything on the interior shell sprayed with some sort of rubberized coating. I'm planning on doing sound/heat barrier of some sort on the interior to keep the sound down and heat out (for our 2 weeks of Montana summer). It seems like it would make...