[Jared]

If you weaken the outer facing wall too much, your elevator will be able to bow in and out in the middle so that the width between the two uprights can change, which, depending on how you lift your carriage, may allow it to twist sideways and pry apart the elevator uprights. We're seeing this on our 1" x 2" x .125" elevator right now, but the elevator uprights are 75.5" tall and are only supported on the very bottom.