I think one of the ideas here is that it is "ok" to "waste" channels. I started with LOR in 2013, so I guess I am a bit pre-conditioned to think in terms of 512 channel universes. Anyway, I like to setup my stuff where, as Jim noted, I am not "breaking across" universe boundaries. I think maybe it is at DIYC I have read that some of the controllers don't do well if models break across universes. So, I just stay away from that when laying out my channels. If I ever do a major revamp, I will probably just do what Gil said--let xlights just layout everything from start to finish....