Find a shop that builds roll cages for Jeeps, pickups ect, or a race car fabricator. They can build you a nice setup, with tabs for lights, canopy ect. They could even build you a full cage as oppossed to a rear roll bar.
One of the first things a lot of people do to Jeeps is install the front "cage" portion addition to the rear roll bar for full driver protection. Many have all new cages built for full protection of those in the front and back seats; ie a "family cage" as it is sometimes called.