Step 10: Imagine the possibilities, all infinity of them.
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Step 3: Cut 3" in on each side
There's probably a better way to do this (like a band saw), but I set up a jig on my chop saw. You SHOULD cut slightly to one side to compensate for the blade thickness, but I will just fill in this gap with washers.
Note that the chop saw will not cut 3" straight all the way down, I had to flip the boards over and even then, there was a "V" shape left inside.