hmmm...not sure. I tried to do it firstly with surfacing and lofts, got the shape but couldn't get it to transform into sheet metal. Tried to use a lofted flange but could'nt add to it. I've seen this before and most places just have a flat piece and account for the amount when twisted.
I have tried various methods to form this part as well. However, I cannot get the helix to be quite as flush and continous as this part is with its flats. Were you able to? If so, how?
I would use ordered mode to make a lofted flange, two rectangles rotated 90 deg to one another. Wouldn't that do it for you?
When you do a lofted flange, you can achieve a twist...but nothing more. The picture shows that it creates an odd edge and SM features cannot be added. You also cannot add any profile guides to a lofted flange.
Picture is a top view