You'll notice the snout attached to the box is upside down. It will be right side up when installed since the door will be facing down. Zooming in you can see the + and - marks just above the orange plug. The Resolve-EV controller wiring will plug into the round black plug. The reddish connector originally plugged into the harness that went through the floor of the Leaf. I guess that just stays unconnected, although there are a couple wires that plug into the hardware within the box connected to this plug.

Separating some of the BMS wiring loom to reach the three separate boxes without needing extension wiring. Considering how we want the battery boxes to be completely modular, I still need to consider extension wiring plugs for quick disconnect.

My truly artistic drawing of the battery cable wiring diagram based on the original battery wiring. I ordered LC-40 welding cable 350amp quick connectors to put in the middle of each battery cable in case a battery box needs to be removed.

I went with a pre-made box that has good sealing for all the Leaf battery command wiring. You can't see it from the picture, but the snout that connects to the motor cable is toward the top of the box in the picture. Not sure what wiring is necessary here but it's all connected as it once was. The box will actually face down once it's all wired, sitting between the frame side to side and between the transfer case and rear battery.

BMS with all the harnesses attached. Not sure if all these connections are necessary for our build but we're going with it until we hear otherwise. Anyone want to comment on what's necessary and not? I'm not sure how to invoke the "@isak" link for his response. It would be great if someone could help me with that.

This is the battery layout with all the wiring connected in its general location. I believe some of this wiring won't be needed due to our very simple build; manual steering, manual brakes, no A/C, no power windows, no heated seats, etc.
https://forum.resolve-ev.com/user/isak, what are your thoughts on what wiring isn't necessary?

This is what we came up with for adding integrity to the side battery boxes. Bolted to the side of the box, we considered the need to remove a module, which this allows without removing the body, and includes a very stable step up. We won't truly know how stable the driving is until it's on the road, but we're very optimistic it will have good driving manners with this configuration.

This is what we came up with for battery installation. We wanted to keep the batteries within their respective configurations. A CJ5 doesn't have much empty space laying around and placing all the batteries in the rear was not a good strategy for weight distribution.

Our drivetrain location moved just a bit so the front drive line had to be decreased by an inch and the rear driveline increase by an inch. Ethan created a jig that assisted him making the precise mods to the drivelines.