I ended having my friend Zach Swain custom make one. This is the second cutting board that I have asked him to make. The measurements are ID of 13-7/8 and an OD of 16-1/2 inches. He can be found at Swain Customs. Just tell him that I referred you.
I like the idea of the lazy susan. I hate to be stupid but I'm not understanding the round rubber door bumpers? What size and what does this do? I'm assuming you are screwing them into the underside of the lazy susan? Thanks