It's the corners that give you the look. IRL, I don't think twisting a round rod will give you the appearance you want. I imagine that in your model and in fabrication you'll have to transition from the rectangle to the circle. IRL, the welds can be ground down to make the transition appear seamless. Virtually, I would add a subdivision element to make the transition, of to make the entire piece. That's appreciably more complex modeling.