Creating a solid column with circular and rectangle base

Hello everybody,

I am trying to design a concrete roof in Dynamo and I am having problems with the implementation because I lack the know-how in Revit Dynamo. (see picture attached)

Can someone help me to implement the idea? I have already generated a model as ifc file in FreeCAD and I still need the calculation model.

Many thanks in advance :slight_smile:

Maybe you can get some usefull tips in this link: