Learn how to Build a Window Seat
Use an 8-foot aluminum straightedge to assist you in making long straight cuts with the accuracy of a table saw. Secure it to the plywood with its built-in clamp and ensure that it is parallel to the edge of the plywood and your intended cutting line. Note that you will brace the foot of your circular saw against the straightedge, but the saw blade will rest on the cutting line.
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