Dennis I used Dynamat extreme it is self adhesive and regularly listed on ebay, it deadned the noise a bit but manily it cut the heat in the cab.
Tony thank you for the picture, combined with Col's faxed drawings I have a good idea of what I'm up against now.
I think I'll try and get the tray on first as that will mean I can still drive on the road as my ambition is to drive to Corowa 2012.