Now on with the box and the well, sort of sounds like a Disney movie, lol!
Here's a shot of the pattern I used for my battery box. It will be cut and folded from .063 aluminum. I wanted a nice smooth look so the sides will fold around and meet in the middle of the back, having only one vertical weld rather than one at each corner. I've also provided flanges on the top and bottom of each side. The top will be folded completely over and create a smooth perimeter top while providing extra strength. On the bottom the flanges will mate to the floor of the box...
Still working on the box lid but you can see the box put together on the right of the next two shots. Jumping on to the tire well...