I found this cutting board/sink cover on Etsy, made by a woodworker in PA, specifically sized for '21-and-newer T@Gs and T@B 320s (he also makes a cover-board to fit the '14-'20 nüCamp sinks). Oiled cherry & black walnut. Yes, it's kinda pricey as cutting boards go. But it's also beeeeeyootiful!
If you're interested in getting one, go here: https://www.etsy.com/shop/KehoeKrafts?ref=shop-header-name&listing_id=1482410346&from_page=listing
Dave in Michigan
'21 T@G XL
"If you don't know where you're going, any road will take you there." ~ The Cheshire Cat (Alice in Wonderland)