You can use cedar fence slats like I did or you can also use pallet wood. I made a few pairs of these using 5 1/2" wide by 6' long by 5/8" thick pieces purchased from Lowe. I had to spend some time sanding them but it was well worth it. We used popsicle sticks to get the proper and even spacing. This was a good excuse for me to also pick up some dewalt clamps to build these. Although I used my craftsman cordless brad nailer to put these together, you could use screws or even hand nail them together. I'll post the link to the decorative metal pieces we hammered into the cross members of the shutters. These were quick, cheap, and easy to make.
Clavos Nails, Premium Grade, 1 1/2 inch Diameter, Matte Black Powder Coat Finish (20) https://a.co/d/isfKMB1
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