On my 35 wagon I am quite sure that the roof slats were basswood, with maple rails. Lumber was rock maple, and some in my case some are bird's eye. the panels are birch veneer. , the panel trim is all maple.
Basswood was favored by Ford’s craftsmen at the Iron Mountain plant because it is exceptionally lightweight, fine-grained, highly stable, and easy to bend into the slight crown shape required for the wagon's long roofline.
Even tho the woodie is the heaviest of the models, Henry was obsessed with weight reduction.. thus the basswood makes sense
Very interesting history on wood selection. He was also an early developer of soybean usage:
"Henry Ford pioneered the industrial use of soybeans to bridge agriculture and manufacturing, a field he termed chemurgy. Starting in 1931, his team developed processes to extract soybean oil and protein-rich meal for automotive production.
Paints and Coatings: By 1934, Ford replaced traditional lacquers with synthetic baked enamels containing roughly 35% soybean oil, significantly reducing production time and labor.
Plastic Components: Researchers mixed soybean meal with phenol and formaldehyde to create a thermoplastic resin. This material was molded into non-structural parts such as gear shift knobs, horn buttons, distributor heads, and accelerator pedals.
Industrial Applications: Soybean oil was also utilized in shock absorbers (as glycerine), foundry sand binders, and even soy-based wool fibers for insulation.
The Soybean Car: In 1941, Ford unveiled a concept car with a body made entirely of soybean-based plastic. Weighing 1,000 pounds less than a steel equivalent, the project was halted by World War II metal shortages.
Food Products: Ford also promoted soybeans for human consumption, including soymilk, tofu, and soy flour breads, to provide affordable protein and support farmers. "