Well, the guy building my Jeep up was showing me some stuff a previous owner had put under the carpet/vinyl in his daughter's car. Can't remember the name of it but can find out if you want.
A bit like the stuff I used to find under the carpet of my old Triumphs - silver backed black stuff that adheres to the floor pan. In those days it was like a bituminous goo, but probably something more environmentally friendly now... 
Obviously wouldn't be a custom fit - but available here. Not sure of the cost though.
Cheers
Mike
'00 D2 Td5 'Alice'
'03 V6 Freelander 'Phoebe'
'04 Td4 Freelander 'Harry'
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