

The pattern is designed to use no mechanical fasteners. The photograph is held in place by the three slats you see in the second picture. After building the prototype above I think I should have raised the top slat and lowered the bottom slat to prevent the picture from rolling in the corners. You might also consider cutting a 4" x 6" piece of black construction paper and glueing it to the back of the picture to prevent back light from showing through.
The project is designed for 1/2" wood. With a little adjustment to the pattern you could use 3/4" thick stock also.

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