craziechild is right, he dint mean u need opt for various brand

yes you can stick to 1 brand.. but there is different tpye of product in a brand...
dynamat have product specialize for hood which is hoodliner
for thermal insulator which is dynaliner

so if roof u wanted to reduce heat n sound, stick a layer of dynamat extreme n another layer of dynaliner... this is what craziechild mean, BTW sorry ya if i explain wrong dont flame bro.

actually personally, this is just my personal thoughts la,
just get stp or dynamat stick 1 layer kaotim...
no need opt for so many layer de la... going for competition meh....
so many layer d car damn heavy wei...

yeah just start with the door 1st... n c how the result... pls dun get cap ayam soundproofing... later the soundproof melted... the material dripping out of your door... wanna clean that time reli GG