I'm planning on casting a thing like this at some point. Its about 10 inches in diameter total (the hoop is 8 inches). Not sure if it'll be brass or aluminium, but alu would probably be easier to cast.

It's way too big for my little 7x12 lathe, so I was wondering if it'd be safe and/or viable to fit it onto a 6 inch rotary table on an X2 sized mill to clean up the casting and maybe locate the holes (looking at the holes in that picture, the maker didnt seem to care about getting them too accurate).
It's all pipe dreams at the moment, but i'm just running through every step to see if it'd be at all possible before I take the plunge.
Oh, and the component is from a zither style banjo, slightly popular in England during the turn of the last century, famous for their poor construction and tinny sound.