Built this around Thanksgiving before I got a miter saw so took a little extra time with circular saw but worked just fine.
Modified the plans only slightly to include 3 seats for all our kids. On one side I put a vertical dowel rod that we can place sand weights over to counter balance the weight when all three are on it. I did use pressure treated pine for the parts that are resting on the ground so that it will last a little longer since it will usually sit in the grass.
Kids love it!