That looks like a very robust setup. I'm not sure how the bracket is fastened to the battery. I would warn you about modifying the battery in any way. Two years ago we had bolted the anderson power connector on the battery. It was mounted in a safe manner with the bolts not protruding through the battery and just on the top on the plastic tabs. Unfortunately, the inspectors at our regional did not agree that it was safe and ordered us to remove them. We almost had to replace the batteries before they would let us compete. Just warning ya, make sure you have a backup plan
