I've assembled quite a few play sets before, and have not seen one that concerns me as much as this one.  There are more than a few spots where sturdy hardware is used to secure to an open ended piece of plastic.  Instead of a bolt going through a hole, it goes through an open ended slot that is twice as wide as the bolt.  Less than half of the washer contacts the plastic it’s securing.  These are very insecure connections.  I don’t know how long this will stay together with a jumping toddler playing on it.