Forgive me for being a "newbie" at this, but why is it necessary to glue (or otherwise attach) the "fences" before attaching the miter bar? Seems to me you could forgo this step until after the miter bar is attached, then continue with your steps for attaching both fences that are square (to both sides). Thus, both are "square" to the sled before kerfing the sled again for square cuts. Wouldn't this eliminate the need for a third fence (and the wasted space it takes up on the sled)?
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