Like I said this was the first time using my new Kreg K4 pocket whole jig. It was awesome it made drilling the holes so easy and the frame came together quick. It also is a really strong joint. Drill the pocket holes in the small 2x4 cross braces and secure them. Note: You could do this without a pocket hole jig if you screwed the holes from the outside into the cross brace boards, however the downside to that is you screw into end grain which makes for a weaker screw hold.