I played a game using a Ratte in the streets of Moscow using the same ruleset. Though I think Ironclad_Paul here modified them a bit; they were the same rules he used for Kaiju games (besides in general simplifying them. The Ratte game was 1 page of rules. A later one was 1/3rd the size). Ogre's great for games at that scale, though hexes make things a bit simpler.
Monstrous vehicles slowly being wittled down by a larger force are fun.