Step 3: Assembly
Strike another centerline up the inside and outside of each leg. The top of the crosspiece (the 2" x 8") should hit the leg somewhere around 11" up the inside of the leg. Mark 11", then use your square to wrap that mark around to the outside. Measure 7" down from that and make another mark. Evenly space three pilot holes in that 7", using a 1/8" bit for the screws and a 3/8" bit to countersink them.
Clamp one leg to a table so it is standing up. Spread glue on the crosspiece, hold it on your marks with one hand and screw it in place with the other hand. Repeat for the other side. Make sure the crosspiece doesn't get twisted, as that will make the thing rock on its feet.
Plug the 3/8" holes with piece of dowel.
Sand and apply your choice of finish. I hand-rubbed in one coat of boiled linseed oil -- cheap, easy, and non-toxic -- and finished with some paste wax. Make sure you put some kind of coat on the thing, as drips of food and liquid will stain the wood and mess it up.