Achieving project goals, but not within required timeframe

Design Specifications for Duplo "tall building with flats like Daddy lives in": Must be 3 stories tall ("no, Mummy, I meant one more"), sorry, 4 stories tall, with stairs all the way up and a garden on the roof where people can sit and look at the view.

Unfortunately, the stairs required some pretty tricky feats of engineering, so the project manager passed out before the building was completed.