Here is an example of how I create the pallet wood canvases my wife and I paint on and sell in our Etsy store, DreamyWoodWorks. They're all 16" x 20" in size and held together with wood glue and underlayment bracings on the back.
Check out my wife's Etsy store, where you can find a slew of handmade wood items:
https://www.etsy.com/shop/DreamyWoodWorks?ref=search_shop_redirect