I did this about 5 or 6 years ago, inspired by a house in my neighborhood of such cyclopean dimensions that it could not have been built for merely human tenants. Here's a screenshot from Google's streetview-
The owner, if I recall correctly, intended to use the place as a home for troubled boys, and so built it as a dorm. He somehow neglected to complete the required forms, the neighbors complained- about the size and the usage, the owner was his own contractor and he went bankrupt and ended up sleeping in his truck parked in front. So the house sat unfinished for several years. The thing about the house that's most visually arresting are the proportions: little teeny windows (they're actually normal-size) poked into a vast facade. The little teeny door under that gargantuan porch. It's like he built a house to normal specs using doll house parts.