pieces of the 5' framing wood side-by-side -- you can add wood glue between the boards if you want, but it's not necessary. Place two mending plates* about 2 feet from either edge, so they should be about 1 foot apart. Screw your mending plates to the wood with the 1" screws. Flip over and secure two more mending plates to the other side in the same fashion (if you don't like the industrial-meets-medieval look of the mending plates, you could just buy more oak and secure it from the bottom to have a clean wooden top). Repeat this process for the remaining 4 pieces of 5' wood, and you should now have two secured surfaces of your corner desk. *I chose the mending plates with the most holes, because I knew I was opting for a thinner plate (liked the look). So I wanted the most opportunities to secure it. But you could definitely make this work with a more traditional mending plate. Next, you'll need to measure the width of one of your surfaces. Four 2x6s next to each other usually adds up to 22" or so, but measure to be sure.* Mark a notch the measurement of the width (probably 22") from edge of the surface along the length. Connect the notch to the opposing corner with your pen, and this should create your 45 angle. Saw along the line. Repeat this process with the other surface. *Fun fact: A 2x6 is not actually 2" by 6"