All the UK Panteras I've seen have the battery under the floor (as in Joules picture). The box is quite 'open' - you could see quite a lot of the side of the battery from under the car.
I recommend it for two reasons:
1 - You get a lot more space for storage.
2 - All the fumes from charging the battery are outside the car.
The only problem I ever had was when I needed to remove the battery. It was a big AC Delco battery that was a tight squeeze - and this made it very difficult to lift out. Solved that problem by making a couple of straps from a old seat belt and leaving them looped around the battery.
I agree with PanteraDoug on the battery cut-off switch.
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