If this was in 15mm, I'd be even more tempted than I already am (for reasons I'll explain in a while) - and I'm pretty tempted as it is.
Basically? Massive multilevel indoor SciFi scenery. If you play Space Hulk or Sedition Wars: Battle for Alabaster, this looks like it would seriously rock. Already way past its initial target, with a while to go (finishes Dec 1)