I would not think that the fuse box should be on the OUTside of the battery box unless you are putting INTO something else. Everyone has a different way of doing things. This worked for me. I brought the wires into the back of the fuse/switch box and then brought the mains into/out of the...
Why is the wiring a nightmare? Can you follow the wires or can you not see them? Sounds like you have the right idea:-) This is a screenshot that helped me out a lot. Good luck.
I took all of the wood out because mine was completely rotten when I got it. I replaced it in two overlapping layers. I cut the pieces to fit, painted them, and then put them in with a solid piece across the top. Replaced the top metal piece. Good luck. This was a pain!