Went to Walmart and picked up a couple of poly cutting boards. Made a cardboard template of the radius corners on the sink in the MH. I used a masonry blade on a Skill saw to trim the cutting board to size, then used an orbital sander to finish off the rough edges and round the corners. Fits perfectly into the double-bowl sink and each one easily stacks on the other if only one sink bowl is needed. Instant extra counter space. Cost of project was less than $20 for both cutting boards vs. $30 to $35 each from Camco.