My map for the compo, it's flat-shaded/fullbright because I don't have HL1 OR HL2... yet. But someday I shall and then it won't look quite so strange.
Pic 1 - Ground floor, the red part will be glass or something.
Pic 2 - Second floor (obviously).
Pic 3 - Flying bell towers that will spread fire from their hindquarters.