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A somewhat loaded question. Batteries fore or aft? Single or dual battery....lengths of run.....total accessories to be used (electric downriggers, etc....). Your boat has two wiring systems. The boat harness, which you already mentioned, is completely separate from the other wiring. Do not mess with/splice into it. Accessory wiring has two determining factors, battery in the transom or relocated in the console. Location and length of run will tell you cable size for starting the motor and accessory use. If the battery gets relocated in the console you would need a heavy cable going back to the motor. Keep the battery (and its weight ) at the stern of the boat......a less heavy cable going to the console. Generally the connection for accessories would start at battery then.......circuit breaker (I say Blue Sea surface mount breaker/switch 30amp up to 50amp depending on your final use)........then fuse panel (from the fuse panel I go to Cole Hersee switches) but they also have switch panels with built in circuit breakers. From those switches you run wires to accessories, thickness of wire determined by amp draw and length of run. I would not install electric downriggers or anchor winch through the panel but would wire directly off the battery going to a separate circuit breaker. This is a starting point for you to start designing a system. I am sure you will have questions as you move along. All wire used "tinned" and I use "heat shrink tinned connectors".