>>8112956>Sounds like my kind of Anime.I recommend reading Manga first. It's not fully translated, but still goes further than the OVA and gives better impression of the world.
I'm huge Apocalypse Zero fag so please give manga a read.
>Which version of the figuarts should I get?The one that looks cooler to you?
Standard version looks like
>>8111949Final stage looks like
>>8108702Yes, you can naturally swap abdomen and head parts between the two.
Just make sure to check actual and not promotional photo, because figure is old and prone to heavy discoloration. You would be disappointed to get one with brown dull eyes instead of striking ruby red ones.