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AJR,
Every electronics manual tells you to run a pair of wires directly from the battery to their component. It keeps the wiring simple and if their product doesn't work, it's easily traced. Problem with that arrangement is multiple connections to the battery, inline fuses everywhere and a general mess of wires running from the console to the stern. Using a buss bar and a fuse block is overkill and overly complicates the wiring when you can use a fuse block with negative bus and be done. The only advantage I could see to using a bus bar is run a single wire run from the battery to the console and then multiple fuse blocks off the bus bar.

Not sure I understand the abbreviation "B+" Are you referring to loosing the battery power? If so, not sure how that figures into running the radio directly off the battery, no power, no radio unless you carry a hand held?

I used bus bars in two instances on my 18 Outrage. The first was for key-on power so I could distribute that to 2 separate devices, NMEA2000 network and Fuel Flow Meter. The second instance was to create a NMEA183 network between the fuel flow meter, the Fishfinder and the GPS. In the first instance all devidces are protected by in-line fuses so no fuse block required. In the second case, it was just easier and cleaner to use the bus bar, than to try to create some splitter.

Good luck on your wiring project.