Dean Bird

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The leading and trailing edge locations for the hatch had been determined. Measure the same distance down from the leading edge of the yellow bars to keep everything square. Lay the ruler across those two points and cut the line just a little short of the blue tape so you can add a corner if you want.

Do the same for the trailing edge of the hatch. Measure down the same distance from the leading edge of the yellow bar and cut the line.