I can only comment on the rear carpets, and just in general, not specific to your car. If the Salesman's Data Book for your car is available, it may have details on interior materials. For years Bill Hirsch who IMO is #1 for interior upholstery materials had a short-nap hogshair carpet material which was a close match for what Packard used in the 30s. Why not contact him and ask for materials? Senior cars during much of the 30s had a pad under the carpet - not sure about the juniors but it can be seen here:
http://www.packardclub.org/forum/viewtopic.php?f=16&t=686 It's a thin pad covered with a synthetic 'fabrikoid" type material.
If you've got some nice details and you know absolutely that they are authentic, how about contributing some photos to that thread on the PAC forum, it's the only place I know of where authentic details are being recorded in a single place and it begs for more contributions.
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