This is cool!  I designed this “Dual Fort” swing set and cross-bridge for my customer’s 6 year old twins.  Constructed with Canadian cedar, the 2 individual forts are connected by an arched bridge.  The center support girder for the bridge carries a pair of swings. Custom ladders lead to platforms that lead to the fort’s rear-entrances, one of which supports the slide.  The treads of the ladders are designed to remove every-other step as the children grow… =)