Wasatch Cat,
The material that was under my door panel was a very dark brown or black plastic-like material. Like Mike “King” mentioned - mine was glued to the door.
The plastic on my doors was so old and brittle that I could not get it off in one piece so I ended up replacing it with some heavy duty plastic. The material I used was shrink wrap film for shrink wrapping boats for outdoor winter storage. It is very thick and durable.
I just looked but was unable to locate it, but I thought someone had a thread on using an acoustic sound deadening material in the doors. It may have been Dynamat but I am not sure.
The way the door panels are designed I think you could put sound deadening under the panel without much issue.
Devin
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