[donandal]

The battery box is made from .060 stainless steel. I made
the box a little bigger than stock ( 2" longer ) to carry a
bigger battery. The back lid has a lip on the inside and outside
to capture the bottom of the box to seal it up, prevent sagging
and hold the lid from sliding down.

The top lid is .100 thick stainless steel to prevent sagging.

The two latches are stainless, and allow the battery to be slid
out the rear, or lifted out the top if necessary.

Once the carpet goes down, it will only be serviced from the bottom.
It doesn't hang lower than the running board brackets, and it is
completely hidden once the boards and gap filler are installed.