I built all my skids except the gastank one. I bought the factory one and I reinforced it with a 1/8 plate. I did install the gas tak skid my self and its a major PITA. You dont need to remove the drive shaft but you have to jack the jeep to get around 2' of clearance from the floor to tank. My stands will only lift 10'' + the 7'' of normal clearance I had to dig 6'' under the jeep
I managed to attach the plastic tank on the frame with a set of straps so I didnt have to unplug the lines but it was a pita and I really hope I wont have to do this again