Step 5, build 4 back walls
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- 7 pieces 8' 2x4s.
Part 1:Cut five 2x4s 7'1.25" long.
Figure 1
The Blue lines are the 7' 1.25" 2x4s, now just screw them into two 8' 2x4s, which are the red lines in figure 1.
Thats it:Your done with the back wall, now repeat this three times so that you have 4 back walls.