I finally got the battery boxes built. I've got blue styrofoam insulation in the bottom with a soil-warming cable taped on top of the styrofoam.
The warming cable keeps the batteries warm on cold nights. Here I'm rearranging connecting cables. Once done, the lid will go on.
I've added some wires and parts in this area. I attached a thermal sensor and 2 fans to the motor. I also added 2 horns to the bridge.