*slow clap* Kudos to you, sir. That battery box is so awesome, and so doomed to corrosive failure
My rig uses a single voltage divider to split a 12v battery into 6v for the bait tank and 12v for the fish finder. Long story short, even that's too much wiring and I bought a 6v battery so I can rewire the whole system in a simpler fashion.
Unless you goop over all those switches that thing is going to short out in like one trip. Those ammo boxes aren't really that waterproof, either. I don;t mean to be a total hater, because that's an elegant and beautiful rig you built, but it's going to be a pain in your butthole.