Welcome to the forum.
The base piece is cast, but the rest can be welded from standard stock (flat bar, bolts, eyes, etc.).
There are several forges around the country, including your area and typically they'll ask for a pattern to make the cast from. You can make this out of wood, milled, sanded, etc. to the shape you want. Don't worry about bolt or fastener holes, which will be drilled after it's cast.
It's also possible you might find a used one at a swap meet, but this will be a hit or miss approuch.