I would absolutely not use that battery with the aluminum (conductive) cover. Actually I think the fiberglass cover I got from Superperformance is safer in any case, my aluminum one is in a box on the shelf. The terminals seem to clear the fiberglass cover fine, but in the event of any accident, no chance of shorting.
I agree. I made a cover for my battery box from fiberglass. Just used left over glass and resin from another project.