How do I make these curvy structures and railings?

[jeremiah.hawlader]

I've spend the past week trying to figure this one out, I could really use some help.

So far I've only learned Extrusion and Blend, but they aren't working for the ones I labeled 1, 2 and 3 which basically follow the stair pathway with some curves along the way. What can I use to make them as accurate as possible? I want to point out that # 1 has thickness toward the center sort of like a fish. 

What I'm trying to replicate (w/ labels)	What I have so far

[L.Maas]

Probably I would create it as a adaptive family or use other software and import it.

[Tom_Kunsman]

Take a look at this YouTube channel, Bin gets into some complex free form shapes - https://www.youtube.com/@BINHE615

[Alfredo_Medina]

You could model most of those shapes as railings, as a top rail. Then, you can complete it with a custom shape at the bottom, maybe a family with a Swept Blend, and an arc path, with the two profiles at different elevations.

Side note, off topic: why people continue doing stairs that don't comply with codes and will not protect children from falling?

[anze.kumar]

1. and 2. could be done with Sweep or Sweep Blend with the proile at the bottom and at the Top. The Path could be chosen with 3D snap -> for snapping use Model Line for the desired curve. The Bottom and Upper part can be Cut using model-in-Place Void Extrusions.

the 3. I would use Adaptive modelling: Create new Generic Model Adaptive family and you import /or model the (right) side curve of the stair. Then create a sweep from bootom to top of the stair and Cut the geometry with (numerous) Generic modl Voids. For Insertion point I would choose bottom or the far edge of the first stair.