Arrange two planks of 26-inch and two planks of 12-inch 2-by-2 lumber into a rectangle. The ends of the 26-inch planks should be on the inside of the 12-inch planks to form the corners of the rectangle.
Drill two pilot holes, sized for the shaft of 3-inch wood screws, through the 12-inch planks into the end of each of the 26-inch planks of the rectangle. Secure the rectangle together with the 3-inch screws through the pilot holes. This is the apron frame of the kitchen table, and will attach to the underside of the wood slab tabletop.
Lay a slab of wood, approximately 2 inches thick and 24-by-36 inches flat on the works surface, with the underside facing upward.
Glue the apron frame onto the underside of the wood slab, centered. There will be approximately 5 inches overhang on all sides of the apron frame.
Drill pilot holes sized for 3-inch wood screws through the apron frame into the underside of the slab every 3 to 4 inches, then secure the frame to the underside of the slab with 3-inch screws.
Position four planks of 26-inch 2-by-6 lumber at each corner of the outside of the apron frame. These are the legs. The 6-inch face of the legs should be flush against the 26-inch side of the apron frame.
Drill four pilot holes sized for 3-inch wood screws through each leg into the side of the apron frame and secure the legs to the frame with 3-inch screws through the pilot holes.
Slide two planks of 12-inch 2-by-2 lumber between the legs, parallel with the 12-inch planks of the apron frame. Push them down unit they are 10 inches down from the ends of the legs. These are the leg braces.
Secure the braces to the legs with two 3-inch wood screws through the legs into each end of the leg braces. Turn the table over and stand it on its legs.