I've discovered something today that makes me sad.
Apparently, there's a limit on the number of items you can have in a room. I can't say how this works for all rooms, I haven't played around with it much, but apparently, the limit is 24 items in the main room (fully expanded) of the first floor.
Which would be *okay*, except... The Chess Set. In order to have a fully displayed chess set, you need to be able to display 36 pieces... Twelve more than the limit.
Stupid Nintendo, why would they do something like that?