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.
Step 2: Glue the boards and clamp it up
After you have your boards lined up, it is time to break out the glue and clamps.
Glue the boards edge to edge and clamp it all up. Try to get all the boards as flat as possible with one-another. This will make things much easier later on...
Let it sit for at least 2-4 hours before you un-clamp the board.