National Woodie Club has a roster of owners and each monthly issue has vendors listed and parts for sale.
I have a 49 Pontiac, body by Ionia, upper half structural wood, and the wood includes upper door panels and quarterpanels in the rear as well as a wood tailgate. The roof is sheet metal,with interior wood-grained steel top bows inside, and interior includes mahogany door panels, and rear quarter panels as well. Chev the same. I can assure you nobody has a stock of parts for the Pontiac; I rather doubt it'll be so for the Chev.