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Smallish chair that can be made with xcarve. https://www.opendesk.cc/regaliz/slim-chair
Use 3/4 plywood and a 1/4 bit. One chair is split up in to two files.
You should have holes where screws will go. I forget what kind I used. Probably 1-1/4 to 1-1/2 inch screws will work. Use woodglue as well.