How old is that picture?
One reason you don't see many wood framed cars around, especially convertibles that had leaky tops. It looks like a lot of work to replace rotten wood.
As a side note, I used to duck hunt outside Belgrade, MT in the late 1970's, there were several areas where old 1920s and 1930s cars had been used for river bank erosion control. Hundreds of prewar cars buried up to their door handles in mud, Fords, Chevs, Plymouths, at least one Cord and many cars I didn't recognize. Not badly rusted above the ground, probably nothing left below ground.
Doug