C9x, I can't open the attached photos for some reason. Dang! Kitz, my brother runs the Optima battery in his modified dirt track car. They are tough batteries! I will look at battery boxes available and then decide where to mount it. Bob mentioned a bulkhead between the trunk and passenger compartment. Should these be welded in or bolted where they can be removed? I will be using the stock seat location and the original package tray. The reason I am asking is that I have found cracks in the hinge area of the trunk lid opening and a crack along the beltline below the side glass behind the door. If the bulkhead was built right, it would strengthen the body quite a bit. Right? This car was a drag race car at one time. These bodies must flex a bunch. Thanks for the replies.