I started by cutting all my boards to length. I was lucky, I was able to use mostly scrap wood from the garage.
4 - 2x4s @ 14" (pine)
4 - 2x4s @ 7" (pine)
1 - 2x4 @ 43" (pine)
2 - 2x6s @ 48" (redwood)
Next, pocket hole the short 2x4s.
Assemble the legs with the pocket holes one the outside. The top will cover the holes there, and the others will face the ground. Just looks cleaner that way. Plus it would be super difficult to screw it together with the screw facing in, because the drill would get in the way.
Pocket hole and glue the two redwood 2x6s together.
Next, screw on the bottom support. I used the pocket hole holes for this. That way the screws were essentially countersunk.
Don't forget to flip the base over before screwing the top to it. The horizontal support piece should be on the lower side of it to make it stronger. You can leave it this way if you want to give it a cleaner look, but just know that it wont have nearly as much lateral support. If you don't have small kids abusing it, that might not be a big deal. But I've learned to over built it, so that it can last longer.
Happy building, and send me photos of your builds (here), I love seeing my designs out in the wild.