Hi Dan,
Great looking car you have there. Please post lots of pics as I will be doing this same exact thing in a few years
. As far as wood goes, I have heard that ASH, and OAK were used as that is what Henry had in his forests.
For sound proofing there are several sound deadeners out there that you can use. Dad used house insulation (not recommended) but that is all he had. Now there is 'Dynamat'-$$$$ or I have heard of other manufacturers making stuff that works just as well but for less money. I would put it everywhere you can Floor, doors, roof, wrap it around the back as well. It will cut down on road noise, vibrations and it will seal the car from heat/cold. Plus it will ride much nicer.
One last piece of advise about the body parts. Do not lose/dent/destroy etc. the lower valance panel. The part that goes under the spare tire in between the rear fenders. They are scarce as hens teeth over here and probably unobtanium over there.
Mike