My #PriusC #battery box dry fit went well. The spare tire needs a little side box thing to keep it around. There's lots of space for other stuff. #toyota uses these very large foam pieces over the tire. Lots of wasted space in that foam.
I'm using #crimpnuts to attach the box to the car. That way I can continue using the car as is and have good connection points to attach the battery. The box actually fits on the 3 rubber tabs that the spare tire would sit on.