Form the 2-inch-thick maple planks into a rectangle on a flat surface. Sand the top, bottom and sides of the wood with an orbital sander. Since the pieces will serve as the top to your table, you need to remove any splinters or chips and leave behind a smooth finish.
Place the four smaller maple planks on top of each other and line the pieces up, making sure that each is the same width, length and thickness. If any of the pieces are slightly larger, sand the wood down with the orbital sander.
Arrange the two-by-four boards in a rectangular shape. Insert one of the maple planks in each corner, as the pieces form the legs. Clamp the pieces together, making the base for your tabletop. Drill two holes through one corner where two of the boards meet, making sure you drill through both layers.
Remove the clamps from each corner and work on one corner at a time. Apply a thin layer of wood glue to one wood plank and press against the leg. Apply more wood glue to the other side of the leg and press against the other wood piece.
Squeeze wood glue into the holes and insert a wood dowel. Gently tap the dowel into place with a hammer until the dowel sits flush with the surrounding wood. Work your way around the table, applying glue and inserting wood dowels until you have the basic frame with the attached legs. Clamp the wood and let it dry overnight.
Reinforce the base of the table with 4-inch wood screws. Screw two of the screws through each end, making sure that the screw goes through to the leg. Attach two screws to the wood surrounding each leg for more stability.
Measure 2 inches down on the remaining plank. Cut four pieces from the plank with a circular saw. Cut the ends of each piece, giving the sides a slant of 45 degrees. Place one of the pieces in each corner of the table frame. Screw two 1.5-inch wood screws through the outside edge of the frame and into the corner brackets.
Flip the frame over so that the legs sit flat on the floor. Screw straight through the top of the table and into the frame with the 1.5-inch wood screws. Cover the top of each screw with a small amount of maple-colored wood filler. Wipe off any excess filler with a damp cloth.