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One caveat to battery size is "does it fit or not?".
My car uses group 31 batteries, mostly because I got them REALLY cheap.
However, they are just a little too big to run longitudinally in the radiator space, whereas group 24 will fit there, and maybe even group 27.
Additionally, if you cut out where the gas tank was, you can fit 5 group 31 batteries in there (without cutting into important body/frame parts) but you can fit 7 group 24 batteries.
If I was using group 24 batteries, I would be able to fit 4 more batteries in essentially the same space. That would make the car a 120V system, without taking up any trunk space whatsoever!
I think it's possible to build a 144V Geo Metro that would look stock from the outside, by using the smaller size batteries.
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