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Your calculations sound about right.
I'm using 12V batteries though. 12V AGMs are usually expensive, but the main reason I'm using them is that I got them cheap, because there were used batteries. They are sealed batteries, which makes it a bit simpler in that there is no water to add, don't have to as easily access the tops to for watering, etc. (Technically, you could even install them sideways or vertical.)
Since the Metro is usually a hatchback, that means all cargo (including batteries) is inside the passenger compartment, so I thought sealed batteries were a good idea that way too.
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