Now people like Skiprat can speak to this moreso but a stainless nut or even a brass nut is a different grade than that you can turn easily especially with wood turning tools. Very interesting look. You can get the same look if you used aluminum and not have to worry about rust. You use the point of a skew to get the dividing lines if that is the look you want. Or you could make small coves to give the look of a rounded nut used. Or just put a black strip of acrylic between stacked pieces of aluminum and polish and you would get the same look and it would be lighter also.
Yes, the look would be really close but I think the wow factor for this one is that it's actually made from real metal nuts, and the weight proves it.
I got some stainless steel nuts to make another one and they are definitely harder that the zinc plated ones. I'll let you know how it goes!