Wow, fantastic thread, beautiful job of everything! Very inspiring.

That firebrick furnace looks like a first class version of the one Terry Aspin shows in his metal casting books, and the chimney is great to see -- nice job there, too.
Terry Aspin also had an outdoor furnace built against the brick wall of a shed -- I have two of his books -- great drawings and text for such small paperbacks.
Thanks for all your fine workmanship!