Depends on your goal

If you want to move the battery to the trunk and you are NOT going to the track its much more simple but there are two ways to do it.

1. just running the long cables to the trunk but this leaves you with one long cable which is hot all the time and is a potential fire hazard.

2. if you add a solenoid in the trunk wired to the starter relay that same cable is hot only when the ignition is turned which now eliminates the fire hazard.

If you are doing this for weight transfer and will be going to the track

3 look at the drawing from Mad electrical in dart4forte’s post, its really the only way to wire the car where it will shut off all electrical power from the rear of the car

I went with #2 option, I may end up converting to #3 at some point.

This could be a whole lot simpler if rules would allow for a disconnect switch to be on the negative side of the switch.

GTXKen