In my defender i moved the ac relays and so forth from the side of the battery box to the front , All the wires are long enough for the move , ill try and take a pic over the weekend ;)
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so can you fit 2 different sized / CCA batteries in and have them charging in your vehicle? or do you need to buy a controller?
you can fit 2 n70s in there but its got to be sideways. I personally recomend going an N70 and a smaller N 50 sized battery as its easier to fit and leaves room for a small compressor and the battery management system.
however if you must have 2 of the biggest batteries you can have that are the same size the N70 is it and the smart thing to do is get them with the terminal positions reversed (n70 and n70Z from memory but confirm that with a battery shop) so that the terminals are close together and the same polarity is on the same side of the vehicle and install them with the +ve terminals closest to center.
Its a lot easier if you do some panelbeating before you try installing them but with the right swear words achievable without the mods.