Here's a picture of a set I built.
Knowing you, you will build a tricker looking set. I built these at work when I worked for the Post Office. We didn't have too much fabrication stuff to work with in that shop. It's 2x3 thick wall tubing that I capped on the ends with plate. The u-bolts came from a local truck spring shop. I took in a stock one and told them to build me a pair 2 inches longer.