Things You'll Need
Instructions
Construct Boxes
Cut plywood into two 17-inch-by-17-inch squares.
Cut the 2-by-4s into 8 pieces--four 17-inch pieces and four 14-inch pieces.
Use the two 14-inch pieces of 2-by-4 and two 17-inch pieces of 2-by-4 to construct a square for each box using two wood screws to connect each corner. Make sure that the two 17-inch pieces and the two 14-inch pieces, for each box, go the same way (vertical or horizontal).
Connect each box to one of the 17-inch-by-17-inch pieces of plywood using three wood screws for each side (24 screws total). Be sure to put screws in from the plywood side of the box.
Build Centerpiece
Cut the PVC pipe into two 3-1/2-inch pieces.
Use wood glue to attach the PVC pipes to the center of each board.
Paint washers different colors to distinguish teams or buy two different types of washers.