Maybe find a modeller for BSP levels (there should be some quake etc. level editors out there) and model a floor of your university.
Oh my! I have think this, but I'm very poor man with graphics tool

As game goal you could maybe do something like finding all computers in that floor and installing a dancing playboy bunny screensaver on them while avoiding getting caught by university officials. This may be a bit childish, but could be fun

Yes, i think as you that this is to much fun, but i don't have idea how i can realize it, can you help me?