Revit export to Cad - walls and floors as Polylines

I am trying to export Revit sheets to cad with the walls, floors, etc. surrounded by polylines. is there any way dynamo can help? only polylines i can get at the moment is the room and space boundaries,.

Try the sketch collection nodes from the Spring nodes packages, they should be able to retrieve the outlines of floors, ceilings roofs etc. - anything sketch based. Walls are harder as they are layer based, but you could intersect their geometry at a plane to get their solid outlines I guess.