I use the sfb code with a small description for easy lookup in the Outliner. For instance:
16 foundations
22 inner wall
23 floor
43 floor finish
etc
Within some of these named groups I create sub-groups that need to be separate but I don't bother to add a number. For instance:
31 entrance door
- door
- frame
etc
Some objects might end up on a custom layer to easily switch between high and low polycount.
It all works fine for me as it creates a nice hierarchy and I can quickly find what I need.
