Insulation and Sound Proofing

Lots of stuff written about this on the web. Personally I'm not convinced, but decided to do it anyway!
The back of the van was completely stripped out. The exposed panels were covered with strips of flashband,

 then with theramawrap

 any gaps, pillars & door panels were filled with recycled plastic bottle insulation

 and finally stretchy carpet.

The idea is that the flashband deadens the tendency for the sheet metal panels to resonate. The original hardboard door panels were covered in the stretchy carpet. The rear windows were tinted using Suntek film. Not the easiest job in the world - but it does give privacy and will help to keep the van cooler on sunny days.
The plywood on the lowered floor was rotten so has be removed and a little filler/rust proofing/paint added to the rear tailgate. The lowered floor was then covered with rubber matting.