Funny you should mention that..... I have been looking at doing the same on my H280.
I am thinking the trunk/backbone will originate under the mast and go port side. On the port side the trunk/backbone will tee and run bow to stern adding tees and drops to pick up equipment.
Under the mast I will pick up power, VHF, and wind. Midship bow I will pick up depth, speed and maybe fresh water. Midship aft engine monitoring. Cockpit GPS, Compass and instrumentation.
I have attached the drawing I am playing with.
Have you shopped for the cabling and connectors?