Instead of 2X4's, I used 1X3's. To dress it up a bit, I took 2 1/2″ carriage bolts, and using my dremel, cut a pattern on them. Then spray painted them Copper.
I really love this bed. 

Hope you enjoy the results as much as I enjoyed playing!

So, I went and got 2 new side Perimiter 2X8's, and had them cut to 82″ which was a perfect fit for my Queen Mattress. 

You can see below that the cuts I had done at the Big Box store aren't exactly square. I should have filled in with putty, but I am not going to worry about it. 
Honestly, I am anxious to get off of the coouch…LOL

Laid out my wood, drilled my Kreg joints, Center support & cleats & Slats in. 

You can see in the first pic below that I had my Miniature Schnauzer Bella helping.