IIRC, US chain is sized by "wire size" meaning the mean diameter as if the link were bent into shape. Again, IIRC, a BB might use 8 or10" wire size studded links. The links themselves would be about 20-24" wide and about 36" long (for our metric friends, diameter of 20cm; width 55-65cm, length ±1m)
A DD use a 2-4" wire size chain, with links about three wire diameters wide and five long.
Stud link chain has a somewhat elliptical shape, and not a long oval. The shape needs to be short enough to wrap around a winch drum or sheave.
Memory is offering up that there is a site that makes either laser-cut, or cast stud link chain to scale, and in quite tiny dimension. Which site that is, is buried in my Favorites somewhere. I will try to dig that out and respond here.