make sure to use a stiff conduit to run along the side... even if you put it in the small black corrugated pipe, it will sag because you can't keep it tight.
I did that as a temporary fix this weekend, and ended up catching the wire with one of my rods and broke off the wire to a switch... made it hard to run my bilge pump to put fresh water back in the livewell.
Some of you may not have had that problem, but it sure did cause me a headache.
In my other boat I ran 4ga wire down the sides, and it was ok because it was a little stiffer wire, but it still sagged in the middle and just looked like crap.