My wife and I loved the version that Finns-Dad made but we wanted it to be rectangular. The top is 1x6s around the edges with 1x4s in between. The frame is 1x4s. The bench tops are all 1x4s with 4x4 legs. There are 3/8 inch lag bolts in the legs. We did 4 coats of the urethane.
This was my first major project, and while there are many things that I would do differently if given the opportunity, we're still very pleased with it.