Step 1: The Stand and Trunk
Cut one 2"x4" into 4 one foot sections to make the base. Stand up the 6' piece of wood to form the stand, preferably clamping it in place during this process. Then fasten two of the one foot sections along the 4" side of the stand, followed by the other two on the 2" side of the stand.
Cut four 6" sections with 45 degree angles on both sides. Fasten these to both the stand and the base, again starting with two that fasten to the 4" side of the stand.
Use the 8x8x12 boxes, or any other long flat cardboard pieces, to form the trunk of the tree. Fasten the trunk cardboard to the trunk 2x4 on just two sides as shown in the above picture. This results in an offset trunk from the base, but provides an extremely sturdy
Step 2: Attach "branches"
Use the 8"x"8"x12" boxes to make the main branches, and the 5"x5"x5" boxes for the smaller branches. The trick for making sturdy branches is to fold the flaps outward whenever possible and tape them to the underlying boxes.
Step 3: Add a Little Texture
Print out plenty of trunk and leaf textures and use spray adhesive or tape to adhere the printouts, and decorate to taste!