Brake drum blacksmith forge - This is how i started out years ago.. a word or warning.. repeated thermal cycling will mess up a concrete block and in a pretty short time too. Having a forge dump over when one shatters is no fun.
This was my second home made anvil. It seemed like a good idea but the overall weight was to low and I never really used it much.
Homemade coal forge from almost all free parts. Oil furnace blower as air supply, old cast iron sink as pan, brake drum as fire pot . Homemade refractory cement inside brake drum.