As I'm fitting active pickups to this guitar I need somewhere to put the battery. I waved a battery box I bought ages ago at the back of the guitar looking for a sane place to fit it. This needs to be in a decent expanse of wood and close to one of the other routes so I can drill a hole to pass the wire down.
I ended up putting it immediately behind the tremolo route. I've seen batteries placed here before and it's become obvious this is a good place for them.
Ideally I would have used a template but I just went for it freehand after taping the guitar and marking out a rough outline of the box. I'm reasonably happy with how it's turned out. The lip on the edge of the box covers a multitide of sins.