I would suggest to add Grid system at column bases and also create floor levels.
This would help us to isolate the grid views & floor levels during the time of geometric modelling.
This has the basis of a nice idea. Are you thinking that you are looking to add the grids after you have created the model rather than as a framework to create you model? If so, what are you looking for the grid to assist you with? Are you thinking that it is used in the Steel AutoDrafter workflow because that is already done as the grids used for the drawings are created based on the model rather than the grids used to create the model.