Yeah Soni's truck is in a whole other league of its own, I would have to cash out the kids college fund to even build something close to what he has accomplished, two big thumbs up Soni. By the way, what is that visor off of? or did you make it yourself?
I would think the 1st thing I would do to a 915 is super singles with 15.5's or 395's on it with hemtt wheels, ditch the front grill guard and see about leveling the suspension. The suspension part can be accomplished pretty easy just make sure you get an alignment when you are done. If you plan on using it as a tractor then you would want to supplement the rear with airbags so when you do load it down you can compensate for the squat. If you don't plan on using it as a tractor then measure out your frame and add a bed and add rails to it so you can bolt and unbolt it to the 5th wheel mounts for a quick change over so the truck can be used as a pickup while not hauling trailers around.