Floors Top Surface Export to 3D dwg

Hello,

I am quite new user to Dynamo and haven’t been using it earlier in connection to Revit. I have a project there we model landscape with floors and we use also vertical cuts in the floors. I would like to export the top surface of all floors to 3D dwg so that Civil 3D users can use it. It would be also great if I can get 3D polyline from floors boundry.

I tried with getting points of floors and creating topography directly but it didnt work in such complicated case with vertical cuts. Does someone have a suggestion on the workflow?