It's only 5 pages...
Here the thread about what I did last year as a new 12V rig. I can get you full size pics of whatever you want. Can answer a few questions too. Got a ton of great advice from RickB here... Ignored some of it... Used most of it.
I also got a good lead on inexpensive wire stock from him out in Washington.
There is no such thing and over engineering and no such thing as too simple. (the simple part is the advice I kinda ignored... sorry Rick)