You need to get lines from AC to Revit:
1a. You can link DWG and try get geometry of Link in Dynamo
1b. You can try export data using DATAEXTRACTION
1c. You try read data directly from Autocad using Interop.
Having lines in Revit it should be easy to create families based on them.
try doing something simpler in dynamo first and work your way to importing cad data.
even if you were to get a script laying out the concept. its best to know the process incase of updates.