Side Doors and Back Wall

The idea as a play structure was to raise the play structure several feet off the ground and have two openings, one side for stairs and the other side for a slide. Since this was a spaceship, it needed doors while traveling through space so that the air would not escape into outer space while the kids were on their mission. So with some hinge, I added a small door on each side about two feet high. Then added a back wall to finish the lower part of the play structure.