I had to read it twice. The "table" is the circular saw base. The drawing is incorrect as it does not show the kerf cut through. So , you line up the left or right kerf edge with your mark on the work piece and then mark the left or right saw base mark on the work piece to show where to clamp the straightedge. Simplified , cruder self aligning straightedge you can build with two layers of plywood or hardboard . This would work work best with longer cuts I think.
I think it is a good idea given caulk joints do eventually fail . In this case the flashing remains intact and the siding can expand and contract over it. I wonder why not use aluminum ?
All well and good and have seen this before and makes sense. What I would like is something similar on a retrofit/rehab/upgrade flashing with the siding and window in place .
I like this but it would seem safer if either more surface area against the fence ,or a slot runner were added to the bottom of inner 2 by material. That would maintain parallelism with the fence.
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