Hey, I'm doing a custom boot install in my zre corolla. (progress can be found in my signature below) Fibreglass is great if you like mess and the smell for a few weeks / months. I prefer mdf. Yes it's heavy, but I not going for a performance car, more cruiser :) As suggested, a optima yellow top would be a sound investment as well a good capacitor. 1 or 2 fared would be ok FYI, I'm near parramatta, so if you need a hand or want tips, just drop us a line.