I have seen many Rockwell Jeeps first hand and can tell you that this setup is all wrong. First off the tires are too small, 42's are minimum. A six cyl is probably way underpowered for that rig and the transmission is sketchy for the abuse that it will see.
Rockwells are so dang heavy that you have to have a huge motor and not be afraid to push the skinny pedal. That's why every time you see rockwells in action the tires are spinning 900 mph. It takes a lot of motivation to get them to climb. I would put a one ton setup with 42's against a Rockwell setup with 44's anyday. The only advantage the Rockwell will have is four wheel steering if equipped.
Keep searching Tug, you can find a better one than that.