38 coupe parcel shelf

My coupe ute seems to be missing the parcel shelf lip which prevents parcels etc. sliding off. I am pretty sure I can see such a lip in Mallast's 38-39 Ford Book, Pg.3-22.

Could someone give me a brief description so that I can make something similar ? E.g. Is it solid wood, ply wood or sheet steel? Is the top edge rolled or shaped ? are the ends squared off or rounded? Any info would be helpful.