My most recent solution to battery relocation is really not unique, its more OEM BMW style, under the back seat, over the area where an OEM muffler would be and thru the floorplan. That in my case makes for an in seat driver accessible battery shut off relatively uncomplicated, and now below the COG, and rearward. But then, I don't have to worry about my front tires lifting off the pavement. grin

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.