The handlebars are a 2' length of 3/4" pipe. I had a couple of plastic rubber handles from when I modified my seed spreader in a earlier post. They came off 1/2" tubing so I heated them up in a toaster oven until soft and stretched them on the 3/4" pipe. Cooled to a very tight fit. After determining a comfortable height to operate the handlebars, I welded them to the back of the mast with a couple of heavy welds. Here's a few pictures.
OK ready for paint, we have a long ways to go before we get there though, ha, ha.