46 woodie

I was just surfing E-Bay under"woodie wagons" and saw an ad for "large roll of woodgrain material' item 281021285912, don't know if this will help you.

I don't know about other makes but Ford wagons used maple for the structural members, basswood for the roof slats and mahogany or gum plywood for the panels. I don't know how the factory applied the finish to the tin woodies but I have seen several that have been professionally wood grained and they look great but it is very expensive!