Sorry, my bad. I did the brace cutouts with a skilsaw and didn't pay too much attention to the dimensions of the hole. You want the braces to be substantial enough to stop the enclosure panels from vibrating, and at he same time you want to leave a large enough hole in the center so air can move freely between the space above the brace and the space below it. I used a piece of scrap wood to draw a line about 1-1/4" from each edge and cut along the lines, leaving a rectangular hole that's about 6" by 12-1/2". The exact dimensions aren't critical.
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