I'd suggest writing instead of "less detailed", only: "Original Terrain, yet fictional streets for the sake of gameplay"
Other than that - keep up the work. If you are interested in making more maps - I am at the very top of people who want to see new creations.

@MattKaza: As I wrote above, it doesn't actually provides any "real" streets, but hey I'm working for a updatet version, and as soon as I've finished this, have fun with this early version

This isn't really a copy of the real Innsbruck as far as I can see, so I don't see why would you advertise it as one.