It would be great if the batteries were hot-swappable in a user-serviceable fashion and accessible via opening the front and rear car doors to reveal a panel at

It would be great if the batteries were hot-swappable in a user-serviceable fashion and accessible via opening the front and rear car doors to reveal a panel at the bottom with battery bays. The batteries could be approximately the width of a hard drive with the depth of the battery being half the width of the vehicle. You would have perhaps 8 such battery bays accessible from behind each door, for 32 hot-swappable bays in total. A quick search shows that the batteries in a Tesla S weigh about 600 pounds, meaning each one would be 20 pounds; easy for just about anybody to change.