Thick cutting board? Neat idea, Dave. I was contemplating having one milled from aluminum. I can work plastic myself.
I think this is it. Wasn't hard to find. There are others. https://www.onlinemetals.com/merchant.cfm?id=79&step=2&top_cat=79&gclid=EAIaIQobChMI0ZSensOE4QIVyoCfCh1-CAFjEAAYASAAEgL-ZvD_BwE