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The Cab bus or Loconet should be as separate from the bus line as possible. Another option I have seen works well for open grid benchwork, nail the bus wire around the layout to the risers for the track.  No holes required.  Drawback is once scenery is complete, wiring becomes difficult to access. I would suggest running a Main Bus around the layout, using shower hooks and brass screw eyes (open ones) as described by Gerry Leone in Off The Rails.  Shower hooks appear to be a huge time saver, are cheap and there is no need to riddle your benchwork with holes and then spend a whole bunch of time pulling wire.  I would twist this main bus.  Put a snubber at the end of this main bus. From the main bus, I would run a sub-bus that taps off of the Main for each Power District.  Install the Circuit breakers locally for each Power district at this point.  Do not twist the sub-bus.   Feeders tap off of the sub-bus only.   Detection goes after the circuit breaker on the the non-twisted sub-bus/feeders. Main bus 12 or 14 AWG stranded copper.  You can step up to 12 AWG if it will not fit into your Command station connection. Sub Bus 16 or 18 AWG stranded copper. Feeders 22-24 AWG solid copper, smashed with pliers at end so they fit nicely onto the lower part of the web of the rail, or fed through copper ties and the ties soldered to the rail.
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