For anyone looking for an awesome series of books, these will expand your backyard workshop. Build Your Own Metal Working Shop From Scrap: https://www.gingerybookstore.com/

You start with learning how to cast, then work on casting parts for a lathe and other projects.

edit: It looks like the site's author has some of these books! He has a page detailing building the lathe: https://www.backyardmetalcasting.com/lathe1.html