I just 'built' custom using ideas I saw on threads like this. It was a fun project.
The main feed is similar to what pc1p has with a resettable breaker at the battery.
I have seen, somewhere, a tray that mounts into the battery tie-down bolts, and provides a simple platform above the battery. I think I saw it on this forum. Any one know of such a product?
Edit: Here it is. @TurboTJ where did you find that? (I see that I asked you in that thread too, but then I was asking about the fuse block, not the mount itself.)