Dynamat extreme will take care of that. It will not take much, in other words you do not have to cover the entire inner and outer door skins to kill the thin sheet metal sound. The Dynamat extreme doesn't smell and holds up well to heat, so it will not melt and run down the door skins causing a big mess. Just be sure to clean the panels really good with acetone before applying. You could use a door kit, but I think a couple of wedge packs will get you the results you want. Just cut into smaller pieces and place at various spots on the door skins. Lightly knock on the panels with your knuckles to find the area that need the material. HTH
John