Cut 2 29" 2x4s (longest side) with one end cut horizontally at a 60 degree angle, and the other end cut vertically at a 60 degree angle. If you place the board with the short side facing up and the horizontal cut end facing toward you, the vertical angle needs to have the vertex on the left side (image 1). Before you start attaching the 2x4s to the table, it is extremely helpful to draw a small guide on the 2x4s you added in the previous step. All you need to do is draw an "X" mark across the exact center of the boards. The lines should be 30 degrees from the center mark you made at the end of the previous step (image 3). Now you can begin adding the 2x4s. Clamp a 2x4 to the top of one of the table legs to the left of the legs with 2x4s already attached (image 2) and line it up with one leg of the "X" mark. Note that it will not be lined up with the centerline, but rather offset about an inch (image 3). If all the boards used to build the table were perfectly straight and not warped or twisted in any way, and all of the measurements and cuts were perfectly accurate, we wouldn't even need the guide marks; but this is wood we're dealing with here, and tiny inaccuracies start to add up after a while, so that's never going to happen. As a result, you may have to force the boards into position a little bit. Drive 2 3" screws to secure the board to the center, and 2 more 2 1/2" screws at the leg. Repeat for the other side of the table.

Now cut 2 more 29" 2x4s with one end cut horizontally at a 60 degree angle, and the other end cut vertically at a 60 degree angle, but this time, cut the vertical angle with the vertex on the opposite side. Clamp and attach it in the same manner as the previous one (images 6 and 7). Repeat for the opposite side (image 8).