I made my own for my '1931 Coach, used ash, and the old scraps as patterns, along with guidance from the sheet metal, the diagrams in the 29-32 parts price list, and photos of new wood carcasses I pulled off internet. Haviong done so, the only part I would buy in future is the door posts, very complicated profiles, not for the novice. '30 posts are a bit simpler (vertical versus slanted upper post), but still I expect they would be your challenge. So wehy not buy the posts and repair anything else yourself. About 50% -60% of my wood was solid and restorable. Good luck.