Attach The Shell of Your Shelf
Once your cleats are installed, cut your 1" x 10" pine boards to the width of your shelves. In our case, we cut our boards to be 48 inches long. You’ll want to cut 2 boards per shelf that you are installing – these will cover both the top and bottom of the cleat you created. Use some adhesive and pin nails to attach the boards to the tops and bottoms of the cleat.
Now you are going to want to measure the new height of your shelves to create a piece for the front. Using that measurement, rip down your 1" x 4" boards to the length and width you need. Using adhesive and pin nails, attach the board to the front of your shelf. Repeat this process for all of your shelves.
You can fill your pin nail holes with wood filler to cover them, or you can leave them untouched for a more rustic look!