I just upgraded my bird house, I am at the same stage as you, but I refuse to spend any more of my hard earned coins on aspen groves, and certainly not real money on gems for upgrade parts so I won?t complete, I?ve been stockpiling corn to upgrade the birdhouse so I?ll at least have something to show for all the time and coins I?ve spent, it is only the one upgrade for the birdhouse, but it?s a bit of a disapointment really as it?s identical to the haunted one except it?s light brown, even the animation is the same.
I have a horrible feeling this event is part of some evil plan by storm8 to make us a use up all our coins on the stupid price of aspen groves so we will all be skint come the Christmas event and be forced to spend real money on Christmas decorations for our farms.