[Doctor's Ford]

May be my question was not clear. I didn't ask if the cover was plywood or any other specific material. What I need to know if the location of the cover, on top of the frame or under the frame? There is a cover mentioned in the 33/34 restoration book (page 6-8) but the photo does not include the cover (see below). From Carl's response I'll take that a board is attached under the frame after upholstery is done to cover all the tacks and the spring.