I wrote to Wright Off Road which supply the mats shown in Michael's (Chucaro's had an earlier ref in the expedition post) post above, The following might be helpfull to anyone thinking about buying some of their product.
Thanks for your interest, the cost for the Acoustic Mat System would be £400 GBP inc delivery to you in Melbourne.
Each Polyurethane sheet would cost you £250 inc delivery to you.
The front is the most important.

