Thanks for posting that design. It is quite utilitarian, I like the long grain cutting boards, and they are easier to make, I use Titebond II and never had a failure. The end grain boards are more for chopping,and the long grain ones are good for slicing. I have made several to span a single or double sink and have a hole in them for catching the scraps in a container in the sink.
When you make the dark/light boards do you make a dark one and a light one and lay one on top of the other to do the curved cut? Then swap pieces to get 2 dark / light colored ones, only opposites?