Not sure how best to word this. I am looking for arcpy solutions/ideas on connecting the endpoints of stacked polyine features together in order to build it into a polygon feature class.
This task done manually is quite simple: just add a new polyline(s) from one start point to the startpoint of the polyline below it and continue this until an entire "side" of the stacked polylines are connected. Then it's just a matter of doing this same thing to the other "side" on the endpoints of each polyline feature. See: