Dan Terelmes, aka EVILDAN, has an excellent ebook on the panel board (or coin board). It's recommended for anyone wishing to expand their knowledge of this still underrated magic prop. You can get all the details and purchase the ebook at the link below.
Note: The above link is an affiliate link. I may get a commission if you purchase through the link. I might even get enough to buy tacos on Taco Tuesday! Ha ha!