Sound Deadening

I also plan to use the butyl rubber sheet rolls (~12" wide") from Home Depot. I have a roll left over from my camping trailer. I will put on the floor just under the dash, up the firewall and around the trans tunnel, and maybe cover with alum broiler foil so not sticky. To stop low drone sounds, you need to add mass to the center of sheet-metal panels. The factory used a rubber spray in the door panels.

To block heat, I will use aluma bubble foam insulation, also from Home Depot. Adds negligible weight. Under the carpet at the front floor and across the roof. I did that in the roof in my Newport about 20 yrs ago, without even glue, just the curve and head-liner bows hold it up. Don't feel the sun and has held up fine I guess (can't see).