I guess this post needs an update... lol
This past year I installed 13 mm of sound / thermal insulation in all the side panels, doors, rear door and also the roof it drops the inside temperature at least 20 to 30 degrees when sitting in the Arizona sun. Combined with the tinted windows driving this is like riding around in a cave. The 13mm insulation is glass reinforced on one side and adhesive on the other and sticks really good to the sheet metal.
This is the roof insulation. It is amazing how much cooler it is with the roof insulated the cross member sections are also sealed off.
I added more storage space on both sides in the back. This is the shelf I made for the left side. It is mounted with two quick disconnect pins so it can be removed for access to the storage underneath. I made it out of 10 Gage aluminum with a carpet covering. You can also see my Co2 tank, magazine holders and Radios. Our 8 radios are encrypted so no one can listen in to our conversations.