Step 5Downstairs Window
To make templates for the posterboard, tape scrap paper over the glass areas only. Don't overlap the frames and don't tape every piece to the glass. You want to be able to remove the template in one piece and make it managable. Be generous with the tape when attaching paper to paper and stingy when attaching paper to glass.
You want the templates as snug as possible to avoid "light leakage" around the posterboard.
I used computer paper that was already printed on one side. Use whatever you have on hand, but using post-it notes for this step will take forever.
After the glass is covered, tape the end of a piece of string to point A. Stretch it over to point B letting it droop to point C in the middle. Tape the string at point B and trace the string line onto the scrap paper.
Next, undo the tape at point B and let the string droop to point D. Tape the string at point B again and trace the string line onto the scrap paper. This is a good time to draw the lines for "teeth".
Everything between the lines is trash. The top and bottom are the templates you will use to trace and cut the posterboard.
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