A. The top is an upside-down, partially assembled Kragsta table. Reinforce legs with extra screws.

B. Use bungee cords or latex surgical tubing for the sling. Screw the ends to the legs of the table. Cut out a piece of leather or vinyl for the center to support the water balloon. The cords are woven through the circle to hold it in place.

C. This is the base of a Jules junior desk chair screwed to the Kragsta tabletop. Its 360-degree spinning capacity allows for maximum defense.

D. Ditch the casters and screw the base directly into the floor of the fort.