I got tired of everything being on layer 0 the other day so I came up with this sceme:  Since all C3D Objects have many parts that are on varying layers much like xref’d data and the object itself resides on its own layer I created layers for each object. The NCS extended template has layers set but I work on commercial jobs not residential.  So all the “ROAD” designations aren’t so applicable.  I may use a cooridor for a drain or a berm or any number of things besides just a road.  I also decided to keep all the C3D objects together so I prefixed them with C3D. Note image below.  I’ll see how well this works for organization.