Trunk Mount Batt. Opinions needed

I just took a look at the wiring you drew. That is a total cluster F--k mess. Get rid of the ford solenoid . Your starter has one built in. All I did was run the Positive cable from the trunk to a positive bulk head on the front frame rail and used that as my positive terminal under the hood. Every other wire was left as the car came. I even have the original battery cable going to the starter running from the bulk head.

When you jump a car with cables you don't need all that spaghetti. I good set of jumpers and you don't even need a battery in the car your starting. Why that Mess?

When I was younger my dad would touch bumpers and vise grip a large wire from the car with the battery to the positive cable on the car without the battery. No problem at all spinning it over
My car is 13-1 compression and spins like the spark plugs are out. Get rid of the mess and stop thinking out of the box.

One cable from the cut off switch to the bulk head and one wire from the cut off to the ignition box. Anything more is not needed. My negative cable goes to the tab on the wheel house . Easy peasy LOL

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