Welcome to the forum.
I made two 2x4’s (1-5/8" x 3-5/8") and an angled 2x6 (1-5/8" x 5-5/8"). I did not include the fillet radii on the pieces.
Place the 2x6 on the two top plates and do a Subtract. After that you can use the Pattern tool to make copies of the 2x6. I spaced them 16" apart in this demo. Hope this helps.
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