" For what it is worth:  Ford's Iron Mountain wood-product factory used two types of wood on 49-51 Ford and Mercury woodie station wagon body panels:  Hard maple for the framing, and Honduran Mahogany for the molded plywood "panels".  The Mahogany has a fairly straight grain, typical of most tropical hardwoods, that is fairly visible even in 1/25 scale.  The maple used for the framing, on the other hand, is a very close-grained wood, meaning that the grain isn't all that visible even in 1:1 scale." 
  
I've noticed that, and it'll make life easier when I start to "woodgrain" the framed portion of the wagon.  Thanks for your observations on the woody's!