Definitely an excellent build, but it seems the main critique from players is waiting in line.
cHeEsEpIzZa2 already said it, but I was thinking that you could have several different mansions so that more than one person could play at the same time, if your computer can handle all the bricks.
You could also limit the player count so that the amount of people waiting in line is never more than 4, or some other low number that's more manageable.