Thank you for your reply. The second option is what I would like to achieve because we would like to be able to quickly test different shapes and sizes of the curved balconies in a detailed 3D view.
I attached two files to clarify what I mean. In the PDF (and also in the .vwx file) you see two polygons and one balcony that has the shape of the first polygon. The 3D balcony was created with the AEC > Create Objects from Shapes... function. I used this function to model the slab, walls and railing/fence object. I hope Marionette can automate the process from polygon to detailed 3D balcony.
With the Create Slab node I can create a slab in the shape of the polygon. But if I want my Marionette network to draw a wall object with the Wall node or Round Wall node I can't use a polygon (or an arc or a line) as a parameter. Basically it comes down to this: from polygon to wall. If you could help me with that then I'm almost there (at least I hope so 😉).