Dave,
Wow. Sounds like a great day. I am / have a swamped week so I won't be able to get to my personal PC for at least a week. I would say that my last layout had too little space between "layers" and that was a real pain to get at any thing under the layout - repairs included so lesson learned - leave room.
My last layout I had three level of viewing specifically because my friends and family had little ones and I wanted them to see it. The next two levels were at 36 and I think by default 50 Cant remember - enjoy your time off.
Kevin