This is made from Maple scraps I had laying in the shop. I used yellow glue. (I highly recommend using a waterproof or outdoor type glue) and finished with a food safe wood finish.
Step 1: Cut and mill your lumber
All of these dimensions are based solely on what I had in the scrap pile and the size I had in mind, so go crazy if you want . Most all regular cutting boards are made in the same fashion.