Wire install on 2001 Pantera III??

I have a new Lowrance HOOK2 – 9″ installed at bow of my Pantera III. Right now just have wiring running direct from starting battery area out to side rails alongside taped clear to the bow – temp hooked up for the unit. Unit works fine so………now I want to run 16 ga (blk/red) wire direct from the starting battery to the bow unit for permanent hookup. Doing that doesn’t appear to be any easy job on this particular rig. I don’t care if I have to work from bow to batt. or vice versa but is there an easy way to get the new wire through and tucked out of the way? Have 30′ of wire so once I have through to both ends will see exactly what I need and trim off the excess. Will be doing same thing on the driver’s console when I get this one done, as 18 yr. old 5″ units there don’t work, but don’t think that will be as much problem – might even have enough wire left over from getting the bow unit done? Anyone having done this on the Pantera III around this year as isn’t looking like a way to get threaded through? THANKS!