Hi Jesse - wow, very nice result!

So let's see - is that a one-rail sweep + scaling rail?

How would you have done this without the scaling rail? I guess maybe NetworkSrf with 4 curves in each direction, or it looks like 2 rail sweep with 2 wavy rails.

I suppose if you have a one-rail sweep where the central spine rail is on the mirroring plane of the object, then a one-rail sweep + scaling rail is actually equivalent to a 2-rail sweep between mirrored rails.

- Michael