I managed to get this simple code to model floors in Revit from a dwg.
The elevation is also produced as an offset from level 0.
The polylines in the dwg must be closed and have no overlapping vertices.
In my case I added a string to pick up all polylines on layer “pl”.
The dwg is picked using pick model elements node.
The package BimorphNodes must be installed for the node ‘CAD.CurvesFromCADLayers’.
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Welcome! Do you have a question or are you just sharing for others?
I didn’t have a question, have I put this in the wrong place?
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No - all shares are welcome. I reclassified it from the Revit category to the ‘share’ category for you though. 
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Ah great, thank you.