Looking for advice

Heck, make a plastic cover, mount it under the battery tray, and mount the electronic ignition components there!
I’ve seen it there as well. On the frame rail under the battery. I’ve been thinking that one was mounted upside down under the battery tray. I do like the short side travel. Same reason AJ said. No high current wires running around getting in the way. The smaller wires just get wrapped together in a twist and into a look if you wish.

When I see the ignition systems inside the car, the wiring from the battery is just made simple.