How can an Imperator Titan house a city on it's shoulders when it's only 100 meters tall?

I've often been confused at the size of Warhammer 40k titans. I've been reading one of the Horus Heresy books and it describes an Imperator class titan as having a small city on it's shoulders with command stations, barracks, etc. At a 100 meters tall this is only 7 meters taller than the statue of liberty. I've been up the statue of liberty and it definitely couldn't host a small city. I get that they're wider but still it seems that it's a bit of a stretch of imagination to suppose that it could host such a large structure.