I think the war machine does belong actually. Reminds me of FF VI to some degrees where you'd have your simple towns, and then you'd have places like Figaro Castle and Vector, which are completely different in terms of tone and technology. Or take FF IV, where you've got the medieval towns and then the advanced technology of Tower of Zot or Babil.
I think a death machine like that should stand out, and if it's got a different art style so be it, the machine itself looks great, and I'd rather not have to wait years for this game to get done with all the art done by a single person. =)