Heat/Sound Insulation

I'm at that same part of the build and I'm trying to figure out how to insulate the interior too. I want to insulate it from the cold, heat, and noise.

I too tried some of the FatMat MegaMat which is butyl based. I keep hearing how much better it is over the asphalt based stuff. At this point I only applied it on portions of the package tray, and it seemed to work a bit. I'd like to buy more for the doors, roof, and floor.

Here's what I bought for the package tray: BLACK FatMat 10 Sq Ft x 70 mil Thick Self-Adhesive Butyl MegaMat Sound Deadener Bulk Pack w/Install Kit I still have a roll left.

For heat, I have been looking for different products that will keep the heat away and also won't catch fire. So far, I've found the following product. It's 3/8" thick and I figure it would be perfect for the roof to sandwich between the headliner and roof.

http://www.summitracing.com/parts/the-14125

Alternative suggestions most welcomed! :)