I know for the YJ they make kits that do this even better. It's a fiberglass hard top that just goes over the front seats and then a divider fills in the gaps to make a truck bed. My jeep sepciality shop's owner has one, it looks sick, especially with his 32s tucked real nice.
DD- 1995 YJ 2.5L, Cat delete, 19lb injectors, 30/9.5r15
Trail Rig- 1994 YJ 4.0L, Rubicon Express 4.5inch lift, 1inch body, D30 Aussie, 33/12.5/r15 Cooper Mud Terrains, front bumper, rocker guards