I'll do my best here...
Mine came with 4 cheapo Pioneers already there. I just used the existing speaker wires - they don't run under the belly but around the front of the boat instead. I believe both of them on the starboard side run up the full length around the bow and back to the glovebox area.
Berg- do you run the front bow speakers and right speaker through those holes in the basement?
Good eye. First had run my sub speaker wire and the bass remote control wire. Those are in one organizer. Couple years later I ran the 1/8" mini cable for my ipod hookup (got tired of reaching over to the glovebox to mess with it). Decided it would be easier to add another organizer instead of pulling that one apart to slip in one more wire. I believe that was a 12ft cable and I had some room to spare. For RCA's I'd guess you would be fine with 15-20ft but always good to measure first. I'll have to do the same myself in a few months.
Why 2 cable organizers in that picture? Not enough room, do they run to the same place? Hard to picture where that hole comes up to since I haven't seen our boat in awhile.
Yes, the wires slip out by the drivers feet but it is way up under the helm and pretty much out of site behind my subwoofer enclosure. No drilling required there - there is enough play between the carpeted panels the wiring will slide right through. Can kind of see it back there-
Does it come up by the drivers feet?
I used 3/4" MDF sheeting - waterproof sealed with Thompsons. I had some left over from my subwoofer box build. Probably overkill but it is what I had.
What kind of material did you use to create the mount for the amps?
Ebay - got a silver marine grade carpet (kinda light duty) that was a very very close match. I bought a few yards of it for around $30 shipped. Covered the amp racks and the subwoofer box. I bought it by the yard at 6ft wide. Just search up "boat marine carpet".
Was the carpet available locally somewhere?
This part was a bit tricky. I did NOT screw into the hull wall at all. I used 2-3 L-shaped galvanized brackets across the bottom that screw into the boards and into the floor. Tucked in tight so they are almost invisible. The center amp actually holds the two separate boards together and covers the seam pretty well. Another L-shaped bracket for the front that anchors into the vent wall. On the top I fashioned a brace about 3/4" wide by 6" long (just basic sheet metal, painted) that screws down on the board on one end and anchors to one of the bolts on the cleat on that side. Used the existing nut and bolt there on the cleat where it comes through to the inside.
Did you just screw the mounted board then to what is there? Have to make sure the screws aren't too long I suppose.
Probably kind of hard to visualize that ^. I'll see if I have any pics floating around. I tell ya though - it's rock solid. Doesn't bounce around at all.