One would not expect wood in a B-17 bomber but there are several items.
Here are a number of items made by volunteers and they will be permanently installed in the airplane:
The floors in the radio room, bombardier/navigator section and aft fuselage. Plus all the ammunition boxes, the radio mounting shelves, the radio operator and navigator tables and… 3 doors. All the wood surfaces are protected with several coats of urethane. During the assembly and fitting of the wooden floors the volunteer found that making the floors exactly per Boeing drawings does not guarantee a proper fit.
As the result of these discrepancies a couple of floors had to be re-made and carefully be fit in these irregular formed spaces.